Ijaz AhmedIjaz Ahmed

Helmut BurkhardtHelmut Burkhardt

Andrea LatinaAndrea Latina

Beam-Halo Generation Study in Beam-Halo Generation Study in CLICCLIC

CLIC Beam Dynamics Meeting CERN 130208CLIC Beam Dynamics Meeting CERN 130208

Collimation SystemCollimation System

(1) Reduce the background by removing particles at large (1) Reduce the background by removing particles at large betatron amplitudes betatron amplitudes (Halo)(Halo) or energy Offsets or energy Offsets

(2) The choice of the collimator apertures should guarantee (2) The choice of the collimator apertures should guarantee good cleaning efficiency of good cleaning efficiency of HaloHalo

(3) to avoid wakefields that might degrade the orbit stability(3) to avoid wakefields that might degrade the orbit stability

Final Focus SystemFinal Focus System

(1)(1) Need to provide a very strong focusingNeed to provide a very strong focusing(2)(2) Reduces the transverse sizes of the beam at the IP Reduces the transverse sizes of the beam at the IP

sufficiently to provide the required luminositysufficiently to provide the required luminosity(3)(3) The correction of chromatic and geometric aberrationsThe correction of chromatic and geometric aberrations

Beam Delivery SystemBeam Delivery SystemBeam Delivery SystemBeam Delivery System

BDS Purpose Reduce the beam sizes to nanometer sizes to produce the BDS Purpose Reduce the beam sizes to nanometer sizes to produce the

luminosityluminosity

βx64171 m

αx-195133

βy182438 m

αy0605865

entrance

βx

7 mm

αx

0

βy

90 μm

αy

0

IP

E 15 TeV

γεx680 nm

γεy10 nm

IP

CLIC BDS OpticsCLIC BDS OpticsCLIC BDS OpticsCLIC BDS Optics

Halo and tail sourcesHalo and tail sourcesHalo and tail sourcesHalo and tail sourcesParticle processes

bull beam-gas scattering (elastic inelastic)bull Synchrotron radiation (coherentincoherent)bull Scattering off thermal photonsbull Ionelectron cloud effectsbull Intrabeam scatteringbull Touschek scattering

Optics related Halo modeling

ndash Mismatch

ndash Coupling

ndash Dispersion

ndash Non-linearities

Various (equipment related

collective)

ndash Noise and vibration

ndash Dark currents

ndash Space charge effects close to

source

ndash Wake fields

ndash Beam loading

ndash Spoiler scattering

Beam-halo collimation Beam-halo collimation Beam-halo collimation Beam-halo collimation

1048698 1048698 Beam haloBeam halo damping ring linac final focus aberrations damping ring linac final focus aberrations etcetc

1048698 1048698 The The beam halobeam halo can result in electromagnetic showers can result in electromagnetic showers and SR reaching the detector (+ muon background)and SR reaching the detector (+ muon background)

1048698 1048698 HaloHalo removed by physically intercepting the particles removed by physically intercepting the particles using mechanical spoilers + thick absorbers to remove using mechanical spoilers + thick absorbers to remove the debristhe debris

1048698 1048698 Thick absorbers then become a source of muons ndash Thick absorbers then become a source of muons ndash should be within tolerable levels at the detectorshould be within tolerable levels at the detector

1048698 1048698 IR layout and mainly final doublet dominateIR layout and mainly final doublet dominate

Beam Halotail and Background at IPBeam Halotail and Background at IPBeam Halotail and Background at IPBeam Halotail and Background at IP

bull Major source of detector backgroundMajor source of detector backgroundbull particles in the beam tail which hit FD andor particles in the beam tail which hit FD andor

emit photons that hit vertex detectoremit photons that hit vertex detectorbull Tails can comeTails can come

bull From FF due to aberrationsFrom FF due to aberrationsbull From damping ring linac etcFrom damping ring linac etc

bull Tails must be collimated amount of collimation Tails must be collimated amount of collimation usually determined byusually determined bybull Ratio FD bore beam size at FD Ratio FD bore beam size at FD

bull This criterion defines a maximum allowed amplitude of particles at the entrance to the FD

bull Secondary muons produced by halo interaction Secondary muons produced by halo interaction with collimators or with other aperture restriction with collimators or with other aperture restriction beamline elementsbeamline elements

Beam-gas scattering Beam-gas scattering phenomenaphenomena

Beam-gas scattering Beam-gas scattering phenomenaphenomena

Beam-gas scattering parametersBeam-gas scattering parameters of particles = 31000 of particles = 31000 initial energy = 1496 GeV initial energy = 1496 GeV of slices = 31 of slices = 31 of macro particles = 1000 of macro particles = 1000N2 gas at room temperature (300K)N2 gas at room temperature (300K)Gas pressure = 10 nTorrGas pressure = 10 nTorr

2

2

)cos1(41

)cos1(2

1

dd el

)1log(

1

1)( mm

mel cc

cE

hcZ mincosmc

min

Angular cut-off for mott scattering cross-sectionAngular cut-off for mott scattering cross-section

Where

Angular distribution of scattered electronsAngular distribution of scattered electrons

Beam divergence

ee

Beam profile at the entranceBeam profile at the entranceBeam profile at the entranceBeam profile at the entrance

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Hori

zon

tal an

gle

Hori

zon

tal an

gle

Vert

ical an

gle

Vert

ical an

gle

VerticalVertical

Beam profile in the final quadrupole Beam profile in the final quadrupole Beam profile in the final quadrupole Beam profile in the final quadrupole

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Hori

zon

tal an

gle

Hori

zon

tal an

gle

Vert

ical an

gle

Vert

ical an

gle

VerticalVertical

Halo Phase space plots in final Halo Phase space plots in final quadrupolequadrupole

Halo Phase space plots in final Halo Phase space plots in final quadrupolequadrupole

rad

HorizontalHorizontal

VerticalVertical

VerticalVertical

Placet-htgen simulationPlacet-htgen simulationPlacet-htgen simulationPlacet-htgen simulation

FullTrackingFullTracking

Temperature 300 KTemperature 300 K

Pressure 10 ntorrPressure 10 ntorr

Scattering angle 10 nradScattering angle 10 nrad

Residual Gas (NResidual Gas (N22))

Lattice with no collimatorsLattice with no collimators

PLACET-Development for trackingPLACET-Development for trackingHTGEN for halo generationHTGEN for halo generation

bull Total no of elements 637Total no of elements 637bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 1496 GeVLinac injection energy 1496 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nrad Emitt Along y-axis 10 nrad

Beam coreBeam core

Beam-HaloBeam-Halo

Collimations region Final Focus

Halomdashparticles with large Halomdashparticles with large

betatron amplitudes or with betatron amplitudes or with

large energy off-setslarge energy off-sets

Longitudinal coordinateLongitudinal coordinate

Beam Delivery SystemBeam Delivery System

Beam squeezing leads

the vertical dispersion

Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)

84 gt1mm

17 gt 10mm

53 gt1mm

05 gt 10mm

82 gt1mm

04 gt 10mm

No significant change in vertical halo (above 1mm) as we go from 1-10 ntorrNo significant change in vertical halo (above 1mm) as we go from 1-10 ntorr

Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)

03 gt1mm)03 gt1mm)

0004 gt10mm 0004 gt10mm

62 gt1mm62 gt1mm

04 gt 10mm04 gt 10mm

84 gt1mm84 gt1mm

17 gt 10mm17 gt 10mm

Small angle less

vertical expension

Inverse of above

Halo- energy dependenceHalo- energy dependenceHalo- energy dependenceHalo- energy dependence

Low energy beamLow energy beam

bullLarge energy spread (~1Large energy spread (~1

bullLarge vertical off-setLarge vertical off-set

Halo gt 102m = 30

Halo gt 1 mm = ~ 3

Halo gt 10 mm = ~ 05

Beam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with aperture

1031

Lattice provided by Javier Resta-lopez

octupole octupole

collimatorcollimator

++

spoilersspoilers

Scatt angleScatt angle Gas pressureGas pressure of halo of halo of lost of lost Lost Lost probabilityprobability

File sizeFile size

q = 01q = 01 10 ntorr10 ntorr ~ 132572~ 132572 55 37x1037x10-5-5 13 MB13 MB

q = 001q = 001 1 ntorr1 ntorr ~ 132572~ 132572 00 13 MB13 MB

q = 001q = 001 5 ntorr5 ntorr ~ 8176465~ 8176465 00 796 MB796 MB

q = 001q = 001 10 ntorr10 ntorr ~ 8176465~ 8176465 22 24x1024x10-7-7 796 MB796 MB

q = 0008q = 0008 10 ntorr10 ntorr ~ 20036933~ 20036933 55 25x1025x10-7-7 2 GB2 GB

Electron beam = 1972236 (192 MB)Electron beam = 1972236 (192 MB) lattice V-06-09-01lattice V-06-09-01

halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 1nt 1282543 halo at angle = 001 P = 1nt 1282543 (63 times 1---gt 10 ntorr pressure)(63 times 1---gt 10 ntorr pressure)

---------------------------------------------------------------------------------------------------------------------------------------- halo at angle = 01 P = 10nt 132572 halo at angle = 01 P = 10nt 132572 halo at angle = 005 P = 10nt 531363 halo at angle = 005 P = 10nt 531363 halo at angle = 001 P = 10nt 20036933 halo at angle = 001 P = 10nt 20036933 (150 times 01 (150 times 01 rad---gt rad---gt rad )rad )

Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)

Halo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINAC

bull FullTrackingFullTrackingbull Temperature 300 KTemperature 300 Kbull Pressure 10 ntorrPressure 10 ntorrbull Scattering angle 10nradScattering angle 10nradbull Residual GasResidual Gas

bull Standard PLACET latticeStandard PLACET latticebull Total no of elements 54068Total no of elements 54068

bull No of Quad 1324No of Quad 1324bull No of BPMs 1324No of BPMs 1324

bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 90 GeVLinac injection energy 90 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nradEmitt Along y-axis 10 nrad

LINAC Beamline LINAC Beamline

Energy of the halo particles is increasing Energy of the halo particles is increasing

almost linearly during passing through the almost linearly during passing through the

acceleratoing structures of the LINACacceleratoing structures of the LINAC

PLACET-HTGEN TrackingPLACET-HTGEN Tracking

Several problems pointed out by me and then

fixed immediately by Helmut

Halo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINAC

HorizontalHorizontal

VerticalVertical

Found no loss of halo Found no loss of halo

Beam-gas scattering + Beam-gas scattering +

Bremsstraulung both Bremsstraulung both

processes are contributing processes are contributing

here due to low energy beam here due to low energy beam

at the time of injectionat the time of injection

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Collimation SystemCollimation System

(1) Reduce the background by removing particles at large (1) Reduce the background by removing particles at large betatron amplitudes betatron amplitudes (Halo)(Halo) or energy Offsets or energy Offsets

(2) The choice of the collimator apertures should guarantee (2) The choice of the collimator apertures should guarantee good cleaning efficiency of good cleaning efficiency of HaloHalo

(3) to avoid wakefields that might degrade the orbit stability(3) to avoid wakefields that might degrade the orbit stability

Final Focus SystemFinal Focus System

(1)(1) Need to provide a very strong focusingNeed to provide a very strong focusing(2)(2) Reduces the transverse sizes of the beam at the IP Reduces the transverse sizes of the beam at the IP

sufficiently to provide the required luminositysufficiently to provide the required luminosity(3)(3) The correction of chromatic and geometric aberrationsThe correction of chromatic and geometric aberrations

Beam Delivery SystemBeam Delivery SystemBeam Delivery SystemBeam Delivery System

BDS Purpose Reduce the beam sizes to nanometer sizes to produce the BDS Purpose Reduce the beam sizes to nanometer sizes to produce the

luminosityluminosity

βx64171 m

αx-195133

βy182438 m

αy0605865

entrance

βx

7 mm

αx

0

βy

90 μm

αy

0

IP

E 15 TeV

γεx680 nm

γεy10 nm

IP

CLIC BDS OpticsCLIC BDS OpticsCLIC BDS OpticsCLIC BDS Optics

Halo and tail sourcesHalo and tail sourcesHalo and tail sourcesHalo and tail sourcesParticle processes

bull beam-gas scattering (elastic inelastic)bull Synchrotron radiation (coherentincoherent)bull Scattering off thermal photonsbull Ionelectron cloud effectsbull Intrabeam scatteringbull Touschek scattering

Optics related Halo modeling

ndash Mismatch

ndash Coupling

ndash Dispersion

ndash Non-linearities

Various (equipment related

collective)

ndash Noise and vibration

ndash Dark currents

ndash Space charge effects close to

source

ndash Wake fields

ndash Beam loading

ndash Spoiler scattering

Beam-halo collimation Beam-halo collimation Beam-halo collimation Beam-halo collimation

1048698 1048698 Beam haloBeam halo damping ring linac final focus aberrations damping ring linac final focus aberrations etcetc

1048698 1048698 The The beam halobeam halo can result in electromagnetic showers can result in electromagnetic showers and SR reaching the detector (+ muon background)and SR reaching the detector (+ muon background)

1048698 1048698 HaloHalo removed by physically intercepting the particles removed by physically intercepting the particles using mechanical spoilers + thick absorbers to remove using mechanical spoilers + thick absorbers to remove the debristhe debris

1048698 1048698 Thick absorbers then become a source of muons ndash Thick absorbers then become a source of muons ndash should be within tolerable levels at the detectorshould be within tolerable levels at the detector

1048698 1048698 IR layout and mainly final doublet dominateIR layout and mainly final doublet dominate

Beam Halotail and Background at IPBeam Halotail and Background at IPBeam Halotail and Background at IPBeam Halotail and Background at IP

bull Major source of detector backgroundMajor source of detector backgroundbull particles in the beam tail which hit FD andor particles in the beam tail which hit FD andor

emit photons that hit vertex detectoremit photons that hit vertex detectorbull Tails can comeTails can come

bull From FF due to aberrationsFrom FF due to aberrationsbull From damping ring linac etcFrom damping ring linac etc

bull Tails must be collimated amount of collimation Tails must be collimated amount of collimation usually determined byusually determined bybull Ratio FD bore beam size at FD Ratio FD bore beam size at FD

bull This criterion defines a maximum allowed amplitude of particles at the entrance to the FD

bull Secondary muons produced by halo interaction Secondary muons produced by halo interaction with collimators or with other aperture restriction with collimators or with other aperture restriction beamline elementsbeamline elements

Beam-gas scattering Beam-gas scattering phenomenaphenomena

Beam-gas scattering Beam-gas scattering phenomenaphenomena

Beam-gas scattering parametersBeam-gas scattering parameters of particles = 31000 of particles = 31000 initial energy = 1496 GeV initial energy = 1496 GeV of slices = 31 of slices = 31 of macro particles = 1000 of macro particles = 1000N2 gas at room temperature (300K)N2 gas at room temperature (300K)Gas pressure = 10 nTorrGas pressure = 10 nTorr

2

2

)cos1(41

)cos1(2

1

dd el

)1log(

1

1)( mm

mel cc

cE

hcZ mincosmc

min

Angular cut-off for mott scattering cross-sectionAngular cut-off for mott scattering cross-section

Where

Angular distribution of scattered electronsAngular distribution of scattered electrons

Beam divergence

ee

Beam profile at the entranceBeam profile at the entranceBeam profile at the entranceBeam profile at the entrance

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Hori

zon

tal an

gle

Hori

zon

tal an

gle

Vert

ical an

gle

Vert

ical an

gle

VerticalVertical

Beam profile in the final quadrupole Beam profile in the final quadrupole Beam profile in the final quadrupole Beam profile in the final quadrupole

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Hori

zon

tal an

gle

Hori

zon

tal an

gle

Vert

ical an

gle

Vert

ical an

gle

VerticalVertical

Halo Phase space plots in final Halo Phase space plots in final quadrupolequadrupole

Halo Phase space plots in final Halo Phase space plots in final quadrupolequadrupole

rad

HorizontalHorizontal

VerticalVertical

VerticalVertical

Placet-htgen simulationPlacet-htgen simulationPlacet-htgen simulationPlacet-htgen simulation

FullTrackingFullTracking

Temperature 300 KTemperature 300 K

Pressure 10 ntorrPressure 10 ntorr

Scattering angle 10 nradScattering angle 10 nrad

Residual Gas (NResidual Gas (N22))

Lattice with no collimatorsLattice with no collimators

PLACET-Development for trackingPLACET-Development for trackingHTGEN for halo generationHTGEN for halo generation

bull Total no of elements 637Total no of elements 637bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 1496 GeVLinac injection energy 1496 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nrad Emitt Along y-axis 10 nrad

Beam coreBeam core

Beam-HaloBeam-Halo

Collimations region Final Focus

Halomdashparticles with large Halomdashparticles with large

betatron amplitudes or with betatron amplitudes or with

large energy off-setslarge energy off-sets

Longitudinal coordinateLongitudinal coordinate

Beam Delivery SystemBeam Delivery System

Beam squeezing leads

the vertical dispersion

Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)

84 gt1mm

17 gt 10mm

53 gt1mm

05 gt 10mm

82 gt1mm

04 gt 10mm

No significant change in vertical halo (above 1mm) as we go from 1-10 ntorrNo significant change in vertical halo (above 1mm) as we go from 1-10 ntorr

Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)

03 gt1mm)03 gt1mm)

0004 gt10mm 0004 gt10mm

62 gt1mm62 gt1mm

04 gt 10mm04 gt 10mm

84 gt1mm84 gt1mm

17 gt 10mm17 gt 10mm

Small angle less

vertical expension

Inverse of above

Halo- energy dependenceHalo- energy dependenceHalo- energy dependenceHalo- energy dependence

Low energy beamLow energy beam

bullLarge energy spread (~1Large energy spread (~1

bullLarge vertical off-setLarge vertical off-set

Halo gt 102m = 30

Halo gt 1 mm = ~ 3

Halo gt 10 mm = ~ 05

Beam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with aperture

1031

Lattice provided by Javier Resta-lopez

octupole octupole

collimatorcollimator

++

spoilersspoilers

Scatt angleScatt angle Gas pressureGas pressure of halo of halo of lost of lost Lost Lost probabilityprobability

File sizeFile size

q = 01q = 01 10 ntorr10 ntorr ~ 132572~ 132572 55 37x1037x10-5-5 13 MB13 MB

q = 001q = 001 1 ntorr1 ntorr ~ 132572~ 132572 00 13 MB13 MB

q = 001q = 001 5 ntorr5 ntorr ~ 8176465~ 8176465 00 796 MB796 MB

q = 001q = 001 10 ntorr10 ntorr ~ 8176465~ 8176465 22 24x1024x10-7-7 796 MB796 MB

q = 0008q = 0008 10 ntorr10 ntorr ~ 20036933~ 20036933 55 25x1025x10-7-7 2 GB2 GB

Electron beam = 1972236 (192 MB)Electron beam = 1972236 (192 MB) lattice V-06-09-01lattice V-06-09-01

halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 1nt 1282543 halo at angle = 001 P = 1nt 1282543 (63 times 1---gt 10 ntorr pressure)(63 times 1---gt 10 ntorr pressure)

---------------------------------------------------------------------------------------------------------------------------------------- halo at angle = 01 P = 10nt 132572 halo at angle = 01 P = 10nt 132572 halo at angle = 005 P = 10nt 531363 halo at angle = 005 P = 10nt 531363 halo at angle = 001 P = 10nt 20036933 halo at angle = 001 P = 10nt 20036933 (150 times 01 (150 times 01 rad---gt rad---gt rad )rad )

Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)

Halo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINAC

bull FullTrackingFullTrackingbull Temperature 300 KTemperature 300 Kbull Pressure 10 ntorrPressure 10 ntorrbull Scattering angle 10nradScattering angle 10nradbull Residual GasResidual Gas

bull Standard PLACET latticeStandard PLACET latticebull Total no of elements 54068Total no of elements 54068

bull No of Quad 1324No of Quad 1324bull No of BPMs 1324No of BPMs 1324

bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 90 GeVLinac injection energy 90 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nradEmitt Along y-axis 10 nrad

LINAC Beamline LINAC Beamline

Energy of the halo particles is increasing Energy of the halo particles is increasing

almost linearly during passing through the almost linearly during passing through the

acceleratoing structures of the LINACacceleratoing structures of the LINAC

PLACET-HTGEN TrackingPLACET-HTGEN Tracking

Several problems pointed out by me and then

fixed immediately by Helmut

Halo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINAC

HorizontalHorizontal

VerticalVertical

Found no loss of halo Found no loss of halo

Beam-gas scattering + Beam-gas scattering +

Bremsstraulung both Bremsstraulung both

processes are contributing processes are contributing

here due to low energy beam here due to low energy beam

at the time of injectionat the time of injection

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

βx64171 m

αx-195133

βy182438 m

αy0605865

entrance

βx

7 mm

αx

0

βy

90 μm

αy

0

IP

E 15 TeV

γεx680 nm

γεy10 nm

IP

CLIC BDS OpticsCLIC BDS OpticsCLIC BDS OpticsCLIC BDS Optics

Halo and tail sourcesHalo and tail sourcesHalo and tail sourcesHalo and tail sourcesParticle processes

bull beam-gas scattering (elastic inelastic)bull Synchrotron radiation (coherentincoherent)bull Scattering off thermal photonsbull Ionelectron cloud effectsbull Intrabeam scatteringbull Touschek scattering

Optics related Halo modeling

ndash Mismatch

ndash Coupling

ndash Dispersion

ndash Non-linearities

Various (equipment related

collective)

ndash Noise and vibration

ndash Dark currents

ndash Space charge effects close to

source

ndash Wake fields

ndash Beam loading

ndash Spoiler scattering

Beam-halo collimation Beam-halo collimation Beam-halo collimation Beam-halo collimation

1048698 1048698 Beam haloBeam halo damping ring linac final focus aberrations damping ring linac final focus aberrations etcetc

1048698 1048698 The The beam halobeam halo can result in electromagnetic showers can result in electromagnetic showers and SR reaching the detector (+ muon background)and SR reaching the detector (+ muon background)

1048698 1048698 HaloHalo removed by physically intercepting the particles removed by physically intercepting the particles using mechanical spoilers + thick absorbers to remove using mechanical spoilers + thick absorbers to remove the debristhe debris

1048698 1048698 Thick absorbers then become a source of muons ndash Thick absorbers then become a source of muons ndash should be within tolerable levels at the detectorshould be within tolerable levels at the detector

1048698 1048698 IR layout and mainly final doublet dominateIR layout and mainly final doublet dominate

Beam Halotail and Background at IPBeam Halotail and Background at IPBeam Halotail and Background at IPBeam Halotail and Background at IP

bull Major source of detector backgroundMajor source of detector backgroundbull particles in the beam tail which hit FD andor particles in the beam tail which hit FD andor

emit photons that hit vertex detectoremit photons that hit vertex detectorbull Tails can comeTails can come

bull From FF due to aberrationsFrom FF due to aberrationsbull From damping ring linac etcFrom damping ring linac etc

bull Tails must be collimated amount of collimation Tails must be collimated amount of collimation usually determined byusually determined bybull Ratio FD bore beam size at FD Ratio FD bore beam size at FD

bull This criterion defines a maximum allowed amplitude of particles at the entrance to the FD

bull Secondary muons produced by halo interaction Secondary muons produced by halo interaction with collimators or with other aperture restriction with collimators or with other aperture restriction beamline elementsbeamline elements

Beam-gas scattering Beam-gas scattering phenomenaphenomena

Beam-gas scattering Beam-gas scattering phenomenaphenomena

Beam-gas scattering parametersBeam-gas scattering parameters of particles = 31000 of particles = 31000 initial energy = 1496 GeV initial energy = 1496 GeV of slices = 31 of slices = 31 of macro particles = 1000 of macro particles = 1000N2 gas at room temperature (300K)N2 gas at room temperature (300K)Gas pressure = 10 nTorrGas pressure = 10 nTorr

2

2

)cos1(41

)cos1(2

1

dd el

)1log(

1

1)( mm

mel cc

cE

hcZ mincosmc

min

Angular cut-off for mott scattering cross-sectionAngular cut-off for mott scattering cross-section

Where

Angular distribution of scattered electronsAngular distribution of scattered electrons

Beam divergence

ee

Beam profile at the entranceBeam profile at the entranceBeam profile at the entranceBeam profile at the entrance

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Hori

zon

tal an

gle

Hori

zon

tal an

gle

Vert

ical an

gle

Vert

ical an

gle

VerticalVertical

Beam profile in the final quadrupole Beam profile in the final quadrupole Beam profile in the final quadrupole Beam profile in the final quadrupole

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Hori

zon

tal an

gle

Hori

zon

tal an

gle

Vert

ical an

gle

Vert

ical an

gle

VerticalVertical

Halo Phase space plots in final Halo Phase space plots in final quadrupolequadrupole

Halo Phase space plots in final Halo Phase space plots in final quadrupolequadrupole

rad

HorizontalHorizontal

VerticalVertical

VerticalVertical

Placet-htgen simulationPlacet-htgen simulationPlacet-htgen simulationPlacet-htgen simulation

FullTrackingFullTracking

Temperature 300 KTemperature 300 K

Pressure 10 ntorrPressure 10 ntorr

Scattering angle 10 nradScattering angle 10 nrad

Residual Gas (NResidual Gas (N22))

Lattice with no collimatorsLattice with no collimators

PLACET-Development for trackingPLACET-Development for trackingHTGEN for halo generationHTGEN for halo generation

bull Total no of elements 637Total no of elements 637bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 1496 GeVLinac injection energy 1496 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nrad Emitt Along y-axis 10 nrad

Beam coreBeam core

Beam-HaloBeam-Halo

Collimations region Final Focus

Halomdashparticles with large Halomdashparticles with large

betatron amplitudes or with betatron amplitudes or with

large energy off-setslarge energy off-sets

Longitudinal coordinateLongitudinal coordinate

Beam Delivery SystemBeam Delivery System

Beam squeezing leads

the vertical dispersion

Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)

84 gt1mm

17 gt 10mm

53 gt1mm

05 gt 10mm

82 gt1mm

04 gt 10mm

No significant change in vertical halo (above 1mm) as we go from 1-10 ntorrNo significant change in vertical halo (above 1mm) as we go from 1-10 ntorr

Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)

03 gt1mm)03 gt1mm)

0004 gt10mm 0004 gt10mm

62 gt1mm62 gt1mm

04 gt 10mm04 gt 10mm

84 gt1mm84 gt1mm

17 gt 10mm17 gt 10mm

Small angle less

vertical expension

Inverse of above

Halo- energy dependenceHalo- energy dependenceHalo- energy dependenceHalo- energy dependence

Low energy beamLow energy beam

bullLarge energy spread (~1Large energy spread (~1

bullLarge vertical off-setLarge vertical off-set

Halo gt 102m = 30

Halo gt 1 mm = ~ 3

Halo gt 10 mm = ~ 05

Beam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with aperture

1031

Lattice provided by Javier Resta-lopez

octupole octupole

collimatorcollimator

++

spoilersspoilers

Scatt angleScatt angle Gas pressureGas pressure of halo of halo of lost of lost Lost Lost probabilityprobability

File sizeFile size

q = 01q = 01 10 ntorr10 ntorr ~ 132572~ 132572 55 37x1037x10-5-5 13 MB13 MB

q = 001q = 001 1 ntorr1 ntorr ~ 132572~ 132572 00 13 MB13 MB

q = 001q = 001 5 ntorr5 ntorr ~ 8176465~ 8176465 00 796 MB796 MB

q = 001q = 001 10 ntorr10 ntorr ~ 8176465~ 8176465 22 24x1024x10-7-7 796 MB796 MB

q = 0008q = 0008 10 ntorr10 ntorr ~ 20036933~ 20036933 55 25x1025x10-7-7 2 GB2 GB

Electron beam = 1972236 (192 MB)Electron beam = 1972236 (192 MB) lattice V-06-09-01lattice V-06-09-01

halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 1nt 1282543 halo at angle = 001 P = 1nt 1282543 (63 times 1---gt 10 ntorr pressure)(63 times 1---gt 10 ntorr pressure)

---------------------------------------------------------------------------------------------------------------------------------------- halo at angle = 01 P = 10nt 132572 halo at angle = 01 P = 10nt 132572 halo at angle = 005 P = 10nt 531363 halo at angle = 005 P = 10nt 531363 halo at angle = 001 P = 10nt 20036933 halo at angle = 001 P = 10nt 20036933 (150 times 01 (150 times 01 rad---gt rad---gt rad )rad )

Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)

Halo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINAC

bull FullTrackingFullTrackingbull Temperature 300 KTemperature 300 Kbull Pressure 10 ntorrPressure 10 ntorrbull Scattering angle 10nradScattering angle 10nradbull Residual GasResidual Gas

bull Standard PLACET latticeStandard PLACET latticebull Total no of elements 54068Total no of elements 54068

bull No of Quad 1324No of Quad 1324bull No of BPMs 1324No of BPMs 1324

bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 90 GeVLinac injection energy 90 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nradEmitt Along y-axis 10 nrad

LINAC Beamline LINAC Beamline

Energy of the halo particles is increasing Energy of the halo particles is increasing

almost linearly during passing through the almost linearly during passing through the

acceleratoing structures of the LINACacceleratoing structures of the LINAC

PLACET-HTGEN TrackingPLACET-HTGEN Tracking

Several problems pointed out by me and then

fixed immediately by Helmut

Halo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINAC

HorizontalHorizontal

VerticalVertical

Found no loss of halo Found no loss of halo

Beam-gas scattering + Beam-gas scattering +

Bremsstraulung both Bremsstraulung both

processes are contributing processes are contributing

here due to low energy beam here due to low energy beam

at the time of injectionat the time of injection

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Halo and tail sourcesHalo and tail sourcesHalo and tail sourcesHalo and tail sourcesParticle processes

bull beam-gas scattering (elastic inelastic)bull Synchrotron radiation (coherentincoherent)bull Scattering off thermal photonsbull Ionelectron cloud effectsbull Intrabeam scatteringbull Touschek scattering

Optics related Halo modeling

ndash Mismatch

ndash Coupling

ndash Dispersion

ndash Non-linearities

Various (equipment related

collective)

ndash Noise and vibration

ndash Dark currents

ndash Space charge effects close to

source

ndash Wake fields

ndash Beam loading

ndash Spoiler scattering

Beam-halo collimation Beam-halo collimation Beam-halo collimation Beam-halo collimation

1048698 1048698 Beam haloBeam halo damping ring linac final focus aberrations damping ring linac final focus aberrations etcetc

1048698 1048698 The The beam halobeam halo can result in electromagnetic showers can result in electromagnetic showers and SR reaching the detector (+ muon background)and SR reaching the detector (+ muon background)

1048698 1048698 HaloHalo removed by physically intercepting the particles removed by physically intercepting the particles using mechanical spoilers + thick absorbers to remove using mechanical spoilers + thick absorbers to remove the debristhe debris

1048698 1048698 Thick absorbers then become a source of muons ndash Thick absorbers then become a source of muons ndash should be within tolerable levels at the detectorshould be within tolerable levels at the detector

1048698 1048698 IR layout and mainly final doublet dominateIR layout and mainly final doublet dominate

Beam Halotail and Background at IPBeam Halotail and Background at IPBeam Halotail and Background at IPBeam Halotail and Background at IP

bull Major source of detector backgroundMajor source of detector backgroundbull particles in the beam tail which hit FD andor particles in the beam tail which hit FD andor

emit photons that hit vertex detectoremit photons that hit vertex detectorbull Tails can comeTails can come

bull From FF due to aberrationsFrom FF due to aberrationsbull From damping ring linac etcFrom damping ring linac etc

bull Tails must be collimated amount of collimation Tails must be collimated amount of collimation usually determined byusually determined bybull Ratio FD bore beam size at FD Ratio FD bore beam size at FD

bull This criterion defines a maximum allowed amplitude of particles at the entrance to the FD

bull Secondary muons produced by halo interaction Secondary muons produced by halo interaction with collimators or with other aperture restriction with collimators or with other aperture restriction beamline elementsbeamline elements

Beam-gas scattering Beam-gas scattering phenomenaphenomena

Beam-gas scattering Beam-gas scattering phenomenaphenomena

Beam-gas scattering parametersBeam-gas scattering parameters of particles = 31000 of particles = 31000 initial energy = 1496 GeV initial energy = 1496 GeV of slices = 31 of slices = 31 of macro particles = 1000 of macro particles = 1000N2 gas at room temperature (300K)N2 gas at room temperature (300K)Gas pressure = 10 nTorrGas pressure = 10 nTorr

2

2

)cos1(41

)cos1(2

1

dd el

)1log(

1

1)( mm

mel cc

cE

hcZ mincosmc

min

Angular cut-off for mott scattering cross-sectionAngular cut-off for mott scattering cross-section

Where

Angular distribution of scattered electronsAngular distribution of scattered electrons

Beam divergence

ee

Beam profile at the entranceBeam profile at the entranceBeam profile at the entranceBeam profile at the entrance

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Hori

zon

tal an

gle

Hori

zon

tal an

gle

Vert

ical an

gle

Vert

ical an

gle

VerticalVertical

Beam profile in the final quadrupole Beam profile in the final quadrupole Beam profile in the final quadrupole Beam profile in the final quadrupole

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Hori

zon

tal an

gle

Hori

zon

tal an

gle

Vert

ical an

gle

Vert

ical an

gle

VerticalVertical

Halo Phase space plots in final Halo Phase space plots in final quadrupolequadrupole

Halo Phase space plots in final Halo Phase space plots in final quadrupolequadrupole

rad

HorizontalHorizontal

VerticalVertical

VerticalVertical

Placet-htgen simulationPlacet-htgen simulationPlacet-htgen simulationPlacet-htgen simulation

FullTrackingFullTracking

Temperature 300 KTemperature 300 K

Pressure 10 ntorrPressure 10 ntorr

Scattering angle 10 nradScattering angle 10 nrad

Residual Gas (NResidual Gas (N22))

Lattice with no collimatorsLattice with no collimators

PLACET-Development for trackingPLACET-Development for trackingHTGEN for halo generationHTGEN for halo generation

bull Total no of elements 637Total no of elements 637bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 1496 GeVLinac injection energy 1496 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nrad Emitt Along y-axis 10 nrad

Beam coreBeam core

Beam-HaloBeam-Halo

Collimations region Final Focus

Halomdashparticles with large Halomdashparticles with large

betatron amplitudes or with betatron amplitudes or with

large energy off-setslarge energy off-sets

Longitudinal coordinateLongitudinal coordinate

Beam Delivery SystemBeam Delivery System

Beam squeezing leads

the vertical dispersion

Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)

84 gt1mm

17 gt 10mm

53 gt1mm

05 gt 10mm

82 gt1mm

04 gt 10mm

No significant change in vertical halo (above 1mm) as we go from 1-10 ntorrNo significant change in vertical halo (above 1mm) as we go from 1-10 ntorr

Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)

03 gt1mm)03 gt1mm)

0004 gt10mm 0004 gt10mm

62 gt1mm62 gt1mm

04 gt 10mm04 gt 10mm

84 gt1mm84 gt1mm

17 gt 10mm17 gt 10mm

Small angle less

vertical expension

Inverse of above

Halo- energy dependenceHalo- energy dependenceHalo- energy dependenceHalo- energy dependence

Low energy beamLow energy beam

bullLarge energy spread (~1Large energy spread (~1

bullLarge vertical off-setLarge vertical off-set

Halo gt 102m = 30

Halo gt 1 mm = ~ 3

Halo gt 10 mm = ~ 05

Beam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with aperture

1031

Lattice provided by Javier Resta-lopez

octupole octupole

collimatorcollimator

++

spoilersspoilers

Scatt angleScatt angle Gas pressureGas pressure of halo of halo of lost of lost Lost Lost probabilityprobability

File sizeFile size

q = 01q = 01 10 ntorr10 ntorr ~ 132572~ 132572 55 37x1037x10-5-5 13 MB13 MB

q = 001q = 001 1 ntorr1 ntorr ~ 132572~ 132572 00 13 MB13 MB

q = 001q = 001 5 ntorr5 ntorr ~ 8176465~ 8176465 00 796 MB796 MB

q = 001q = 001 10 ntorr10 ntorr ~ 8176465~ 8176465 22 24x1024x10-7-7 796 MB796 MB

q = 0008q = 0008 10 ntorr10 ntorr ~ 20036933~ 20036933 55 25x1025x10-7-7 2 GB2 GB

Electron beam = 1972236 (192 MB)Electron beam = 1972236 (192 MB) lattice V-06-09-01lattice V-06-09-01

halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 1nt 1282543 halo at angle = 001 P = 1nt 1282543 (63 times 1---gt 10 ntorr pressure)(63 times 1---gt 10 ntorr pressure)

---------------------------------------------------------------------------------------------------------------------------------------- halo at angle = 01 P = 10nt 132572 halo at angle = 01 P = 10nt 132572 halo at angle = 005 P = 10nt 531363 halo at angle = 005 P = 10nt 531363 halo at angle = 001 P = 10nt 20036933 halo at angle = 001 P = 10nt 20036933 (150 times 01 (150 times 01 rad---gt rad---gt rad )rad )

Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)

Halo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINAC

bull FullTrackingFullTrackingbull Temperature 300 KTemperature 300 Kbull Pressure 10 ntorrPressure 10 ntorrbull Scattering angle 10nradScattering angle 10nradbull Residual GasResidual Gas

bull Standard PLACET latticeStandard PLACET latticebull Total no of elements 54068Total no of elements 54068

bull No of Quad 1324No of Quad 1324bull No of BPMs 1324No of BPMs 1324

bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 90 GeVLinac injection energy 90 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nradEmitt Along y-axis 10 nrad

LINAC Beamline LINAC Beamline

Energy of the halo particles is increasing Energy of the halo particles is increasing

almost linearly during passing through the almost linearly during passing through the

acceleratoing structures of the LINACacceleratoing structures of the LINAC

PLACET-HTGEN TrackingPLACET-HTGEN Tracking

Several problems pointed out by me and then

fixed immediately by Helmut

Halo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINAC

HorizontalHorizontal

VerticalVertical

Found no loss of halo Found no loss of halo

Beam-gas scattering + Beam-gas scattering +

Bremsstraulung both Bremsstraulung both

processes are contributing processes are contributing

here due to low energy beam here due to low energy beam

at the time of injectionat the time of injection

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Beam-halo collimation Beam-halo collimation Beam-halo collimation Beam-halo collimation

1048698 1048698 Beam haloBeam halo damping ring linac final focus aberrations damping ring linac final focus aberrations etcetc

1048698 1048698 The The beam halobeam halo can result in electromagnetic showers can result in electromagnetic showers and SR reaching the detector (+ muon background)and SR reaching the detector (+ muon background)

1048698 1048698 HaloHalo removed by physically intercepting the particles removed by physically intercepting the particles using mechanical spoilers + thick absorbers to remove using mechanical spoilers + thick absorbers to remove the debristhe debris

1048698 1048698 Thick absorbers then become a source of muons ndash Thick absorbers then become a source of muons ndash should be within tolerable levels at the detectorshould be within tolerable levels at the detector

1048698 1048698 IR layout and mainly final doublet dominateIR layout and mainly final doublet dominate

Beam Halotail and Background at IPBeam Halotail and Background at IPBeam Halotail and Background at IPBeam Halotail and Background at IP

bull Major source of detector backgroundMajor source of detector backgroundbull particles in the beam tail which hit FD andor particles in the beam tail which hit FD andor

emit photons that hit vertex detectoremit photons that hit vertex detectorbull Tails can comeTails can come

bull From FF due to aberrationsFrom FF due to aberrationsbull From damping ring linac etcFrom damping ring linac etc

bull Tails must be collimated amount of collimation Tails must be collimated amount of collimation usually determined byusually determined bybull Ratio FD bore beam size at FD Ratio FD bore beam size at FD

bull This criterion defines a maximum allowed amplitude of particles at the entrance to the FD

bull Secondary muons produced by halo interaction Secondary muons produced by halo interaction with collimators or with other aperture restriction with collimators or with other aperture restriction beamline elementsbeamline elements

Beam-gas scattering Beam-gas scattering phenomenaphenomena

Beam-gas scattering Beam-gas scattering phenomenaphenomena

Beam-gas scattering parametersBeam-gas scattering parameters of particles = 31000 of particles = 31000 initial energy = 1496 GeV initial energy = 1496 GeV of slices = 31 of slices = 31 of macro particles = 1000 of macro particles = 1000N2 gas at room temperature (300K)N2 gas at room temperature (300K)Gas pressure = 10 nTorrGas pressure = 10 nTorr

2

2

)cos1(41

)cos1(2

1

dd el

)1log(

1

1)( mm

mel cc

cE

hcZ mincosmc

min

Angular cut-off for mott scattering cross-sectionAngular cut-off for mott scattering cross-section

Where

Angular distribution of scattered electronsAngular distribution of scattered electrons

Beam divergence

ee

Beam profile at the entranceBeam profile at the entranceBeam profile at the entranceBeam profile at the entrance

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Hori

zon

tal an

gle

Hori

zon

tal an

gle

Vert

ical an

gle

Vert

ical an

gle

VerticalVertical

Beam profile in the final quadrupole Beam profile in the final quadrupole Beam profile in the final quadrupole Beam profile in the final quadrupole

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Hori

zon

tal an

gle

Hori

zon

tal an

gle

Vert

ical an

gle

Vert

ical an

gle

VerticalVertical

Halo Phase space plots in final Halo Phase space plots in final quadrupolequadrupole

Halo Phase space plots in final Halo Phase space plots in final quadrupolequadrupole

rad

HorizontalHorizontal

VerticalVertical

VerticalVertical

Placet-htgen simulationPlacet-htgen simulationPlacet-htgen simulationPlacet-htgen simulation

FullTrackingFullTracking

Temperature 300 KTemperature 300 K

Pressure 10 ntorrPressure 10 ntorr

Scattering angle 10 nradScattering angle 10 nrad

Residual Gas (NResidual Gas (N22))

Lattice with no collimatorsLattice with no collimators

PLACET-Development for trackingPLACET-Development for trackingHTGEN for halo generationHTGEN for halo generation

bull Total no of elements 637Total no of elements 637bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 1496 GeVLinac injection energy 1496 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nrad Emitt Along y-axis 10 nrad

Beam coreBeam core

Beam-HaloBeam-Halo

Collimations region Final Focus

Halomdashparticles with large Halomdashparticles with large

betatron amplitudes or with betatron amplitudes or with

large energy off-setslarge energy off-sets

Longitudinal coordinateLongitudinal coordinate

Beam Delivery SystemBeam Delivery System

Beam squeezing leads

the vertical dispersion

Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)

84 gt1mm

17 gt 10mm

53 gt1mm

05 gt 10mm

82 gt1mm

04 gt 10mm

No significant change in vertical halo (above 1mm) as we go from 1-10 ntorrNo significant change in vertical halo (above 1mm) as we go from 1-10 ntorr

Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)

03 gt1mm)03 gt1mm)

0004 gt10mm 0004 gt10mm

62 gt1mm62 gt1mm

04 gt 10mm04 gt 10mm

84 gt1mm84 gt1mm

17 gt 10mm17 gt 10mm

Small angle less

vertical expension

Inverse of above

Halo- energy dependenceHalo- energy dependenceHalo- energy dependenceHalo- energy dependence

Low energy beamLow energy beam

bullLarge energy spread (~1Large energy spread (~1

bullLarge vertical off-setLarge vertical off-set

Halo gt 102m = 30

Halo gt 1 mm = ~ 3

Halo gt 10 mm = ~ 05

Beam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with aperture

1031

Lattice provided by Javier Resta-lopez

octupole octupole

collimatorcollimator

++

spoilersspoilers

Scatt angleScatt angle Gas pressureGas pressure of halo of halo of lost of lost Lost Lost probabilityprobability

File sizeFile size

q = 01q = 01 10 ntorr10 ntorr ~ 132572~ 132572 55 37x1037x10-5-5 13 MB13 MB

q = 001q = 001 1 ntorr1 ntorr ~ 132572~ 132572 00 13 MB13 MB

q = 001q = 001 5 ntorr5 ntorr ~ 8176465~ 8176465 00 796 MB796 MB

q = 001q = 001 10 ntorr10 ntorr ~ 8176465~ 8176465 22 24x1024x10-7-7 796 MB796 MB

q = 0008q = 0008 10 ntorr10 ntorr ~ 20036933~ 20036933 55 25x1025x10-7-7 2 GB2 GB

Electron beam = 1972236 (192 MB)Electron beam = 1972236 (192 MB) lattice V-06-09-01lattice V-06-09-01

halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 1nt 1282543 halo at angle = 001 P = 1nt 1282543 (63 times 1---gt 10 ntorr pressure)(63 times 1---gt 10 ntorr pressure)

---------------------------------------------------------------------------------------------------------------------------------------- halo at angle = 01 P = 10nt 132572 halo at angle = 01 P = 10nt 132572 halo at angle = 005 P = 10nt 531363 halo at angle = 005 P = 10nt 531363 halo at angle = 001 P = 10nt 20036933 halo at angle = 001 P = 10nt 20036933 (150 times 01 (150 times 01 rad---gt rad---gt rad )rad )

Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)

Halo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINAC

bull FullTrackingFullTrackingbull Temperature 300 KTemperature 300 Kbull Pressure 10 ntorrPressure 10 ntorrbull Scattering angle 10nradScattering angle 10nradbull Residual GasResidual Gas

bull Standard PLACET latticeStandard PLACET latticebull Total no of elements 54068Total no of elements 54068

bull No of Quad 1324No of Quad 1324bull No of BPMs 1324No of BPMs 1324

bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 90 GeVLinac injection energy 90 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nradEmitt Along y-axis 10 nrad

LINAC Beamline LINAC Beamline

Energy of the halo particles is increasing Energy of the halo particles is increasing

almost linearly during passing through the almost linearly during passing through the

acceleratoing structures of the LINACacceleratoing structures of the LINAC

PLACET-HTGEN TrackingPLACET-HTGEN Tracking

Several problems pointed out by me and then

fixed immediately by Helmut

Halo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINAC

HorizontalHorizontal

VerticalVertical

Found no loss of halo Found no loss of halo

Beam-gas scattering + Beam-gas scattering +

Bremsstraulung both Bremsstraulung both

processes are contributing processes are contributing

here due to low energy beam here due to low energy beam

at the time of injectionat the time of injection

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Beam Halotail and Background at IPBeam Halotail and Background at IPBeam Halotail and Background at IPBeam Halotail and Background at IP

bull Major source of detector backgroundMajor source of detector backgroundbull particles in the beam tail which hit FD andor particles in the beam tail which hit FD andor

emit photons that hit vertex detectoremit photons that hit vertex detectorbull Tails can comeTails can come

bull From FF due to aberrationsFrom FF due to aberrationsbull From damping ring linac etcFrom damping ring linac etc

bull Tails must be collimated amount of collimation Tails must be collimated amount of collimation usually determined byusually determined bybull Ratio FD bore beam size at FD Ratio FD bore beam size at FD

bull This criterion defines a maximum allowed amplitude of particles at the entrance to the FD

bull Secondary muons produced by halo interaction Secondary muons produced by halo interaction with collimators or with other aperture restriction with collimators or with other aperture restriction beamline elementsbeamline elements

Beam-gas scattering Beam-gas scattering phenomenaphenomena

Beam-gas scattering Beam-gas scattering phenomenaphenomena

Beam-gas scattering parametersBeam-gas scattering parameters of particles = 31000 of particles = 31000 initial energy = 1496 GeV initial energy = 1496 GeV of slices = 31 of slices = 31 of macro particles = 1000 of macro particles = 1000N2 gas at room temperature (300K)N2 gas at room temperature (300K)Gas pressure = 10 nTorrGas pressure = 10 nTorr

2

2

)cos1(41

)cos1(2

1

dd el

)1log(

1

1)( mm

mel cc

cE

hcZ mincosmc

min

Angular cut-off for mott scattering cross-sectionAngular cut-off for mott scattering cross-section

Where

Angular distribution of scattered electronsAngular distribution of scattered electrons

Beam divergence

ee

Beam profile at the entranceBeam profile at the entranceBeam profile at the entranceBeam profile at the entrance

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Hori

zon

tal an

gle

Hori

zon

tal an

gle

Vert

ical an

gle

Vert

ical an

gle

VerticalVertical

Beam profile in the final quadrupole Beam profile in the final quadrupole Beam profile in the final quadrupole Beam profile in the final quadrupole

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Hori

zon

tal an

gle

Hori

zon

tal an

gle

Vert

ical an

gle

Vert

ical an

gle

VerticalVertical

Halo Phase space plots in final Halo Phase space plots in final quadrupolequadrupole

Halo Phase space plots in final Halo Phase space plots in final quadrupolequadrupole

rad

HorizontalHorizontal

VerticalVertical

VerticalVertical

Placet-htgen simulationPlacet-htgen simulationPlacet-htgen simulationPlacet-htgen simulation

FullTrackingFullTracking

Temperature 300 KTemperature 300 K

Pressure 10 ntorrPressure 10 ntorr

Scattering angle 10 nradScattering angle 10 nrad

Residual Gas (NResidual Gas (N22))

Lattice with no collimatorsLattice with no collimators

PLACET-Development for trackingPLACET-Development for trackingHTGEN for halo generationHTGEN for halo generation

bull Total no of elements 637Total no of elements 637bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 1496 GeVLinac injection energy 1496 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nrad Emitt Along y-axis 10 nrad

Beam coreBeam core

Beam-HaloBeam-Halo

Collimations region Final Focus

Halomdashparticles with large Halomdashparticles with large

betatron amplitudes or with betatron amplitudes or with

large energy off-setslarge energy off-sets

Longitudinal coordinateLongitudinal coordinate

Beam Delivery SystemBeam Delivery System

Beam squeezing leads

the vertical dispersion

Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)

84 gt1mm

17 gt 10mm

53 gt1mm

05 gt 10mm

82 gt1mm

04 gt 10mm

No significant change in vertical halo (above 1mm) as we go from 1-10 ntorrNo significant change in vertical halo (above 1mm) as we go from 1-10 ntorr

Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)

03 gt1mm)03 gt1mm)

0004 gt10mm 0004 gt10mm

62 gt1mm62 gt1mm

04 gt 10mm04 gt 10mm

84 gt1mm84 gt1mm

17 gt 10mm17 gt 10mm

Small angle less

vertical expension

Inverse of above

Halo- energy dependenceHalo- energy dependenceHalo- energy dependenceHalo- energy dependence

Low energy beamLow energy beam

bullLarge energy spread (~1Large energy spread (~1

bullLarge vertical off-setLarge vertical off-set

Halo gt 102m = 30

Halo gt 1 mm = ~ 3

Halo gt 10 mm = ~ 05

Beam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with aperture

1031

Lattice provided by Javier Resta-lopez

octupole octupole

collimatorcollimator

++

spoilersspoilers

Scatt angleScatt angle Gas pressureGas pressure of halo of halo of lost of lost Lost Lost probabilityprobability

File sizeFile size

q = 01q = 01 10 ntorr10 ntorr ~ 132572~ 132572 55 37x1037x10-5-5 13 MB13 MB

q = 001q = 001 1 ntorr1 ntorr ~ 132572~ 132572 00 13 MB13 MB

q = 001q = 001 5 ntorr5 ntorr ~ 8176465~ 8176465 00 796 MB796 MB

q = 001q = 001 10 ntorr10 ntorr ~ 8176465~ 8176465 22 24x1024x10-7-7 796 MB796 MB

q = 0008q = 0008 10 ntorr10 ntorr ~ 20036933~ 20036933 55 25x1025x10-7-7 2 GB2 GB

Electron beam = 1972236 (192 MB)Electron beam = 1972236 (192 MB) lattice V-06-09-01lattice V-06-09-01

halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 1nt 1282543 halo at angle = 001 P = 1nt 1282543 (63 times 1---gt 10 ntorr pressure)(63 times 1---gt 10 ntorr pressure)

---------------------------------------------------------------------------------------------------------------------------------------- halo at angle = 01 P = 10nt 132572 halo at angle = 01 P = 10nt 132572 halo at angle = 005 P = 10nt 531363 halo at angle = 005 P = 10nt 531363 halo at angle = 001 P = 10nt 20036933 halo at angle = 001 P = 10nt 20036933 (150 times 01 (150 times 01 rad---gt rad---gt rad )rad )

Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)

Halo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINAC

bull FullTrackingFullTrackingbull Temperature 300 KTemperature 300 Kbull Pressure 10 ntorrPressure 10 ntorrbull Scattering angle 10nradScattering angle 10nradbull Residual GasResidual Gas

bull Standard PLACET latticeStandard PLACET latticebull Total no of elements 54068Total no of elements 54068

bull No of Quad 1324No of Quad 1324bull No of BPMs 1324No of BPMs 1324

bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 90 GeVLinac injection energy 90 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nradEmitt Along y-axis 10 nrad

LINAC Beamline LINAC Beamline

Energy of the halo particles is increasing Energy of the halo particles is increasing

almost linearly during passing through the almost linearly during passing through the

acceleratoing structures of the LINACacceleratoing structures of the LINAC

PLACET-HTGEN TrackingPLACET-HTGEN Tracking

Several problems pointed out by me and then

fixed immediately by Helmut

Halo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINAC

HorizontalHorizontal

VerticalVertical

Found no loss of halo Found no loss of halo

Beam-gas scattering + Beam-gas scattering +

Bremsstraulung both Bremsstraulung both

processes are contributing processes are contributing

here due to low energy beam here due to low energy beam

at the time of injectionat the time of injection

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Beam-gas scattering Beam-gas scattering phenomenaphenomena

Beam-gas scattering Beam-gas scattering phenomenaphenomena

Beam-gas scattering parametersBeam-gas scattering parameters of particles = 31000 of particles = 31000 initial energy = 1496 GeV initial energy = 1496 GeV of slices = 31 of slices = 31 of macro particles = 1000 of macro particles = 1000N2 gas at room temperature (300K)N2 gas at room temperature (300K)Gas pressure = 10 nTorrGas pressure = 10 nTorr

2

2

)cos1(41

)cos1(2

1

dd el

)1log(

1

1)( mm

mel cc

cE

hcZ mincosmc

min

Angular cut-off for mott scattering cross-sectionAngular cut-off for mott scattering cross-section

Where

Angular distribution of scattered electronsAngular distribution of scattered electrons

Beam divergence

ee

Beam profile at the entranceBeam profile at the entranceBeam profile at the entranceBeam profile at the entrance

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Hori

zon

tal an

gle

Hori

zon

tal an

gle

Vert

ical an

gle

Vert

ical an

gle

VerticalVertical

Beam profile in the final quadrupole Beam profile in the final quadrupole Beam profile in the final quadrupole Beam profile in the final quadrupole

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Hori

zon

tal an

gle

Hori

zon

tal an

gle

Vert

ical an

gle

Vert

ical an

gle

VerticalVertical

Halo Phase space plots in final Halo Phase space plots in final quadrupolequadrupole

Halo Phase space plots in final Halo Phase space plots in final quadrupolequadrupole

rad

HorizontalHorizontal

VerticalVertical

VerticalVertical

Placet-htgen simulationPlacet-htgen simulationPlacet-htgen simulationPlacet-htgen simulation

FullTrackingFullTracking

Temperature 300 KTemperature 300 K

Pressure 10 ntorrPressure 10 ntorr

Scattering angle 10 nradScattering angle 10 nrad

Residual Gas (NResidual Gas (N22))

Lattice with no collimatorsLattice with no collimators

PLACET-Development for trackingPLACET-Development for trackingHTGEN for halo generationHTGEN for halo generation

bull Total no of elements 637Total no of elements 637bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 1496 GeVLinac injection energy 1496 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nrad Emitt Along y-axis 10 nrad

Beam coreBeam core

Beam-HaloBeam-Halo

Collimations region Final Focus

Halomdashparticles with large Halomdashparticles with large

betatron amplitudes or with betatron amplitudes or with

large energy off-setslarge energy off-sets

Longitudinal coordinateLongitudinal coordinate

Beam Delivery SystemBeam Delivery System

Beam squeezing leads

the vertical dispersion

Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)

84 gt1mm

17 gt 10mm

53 gt1mm

05 gt 10mm

82 gt1mm

04 gt 10mm

No significant change in vertical halo (above 1mm) as we go from 1-10 ntorrNo significant change in vertical halo (above 1mm) as we go from 1-10 ntorr

Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)

03 gt1mm)03 gt1mm)

0004 gt10mm 0004 gt10mm

62 gt1mm62 gt1mm

04 gt 10mm04 gt 10mm

84 gt1mm84 gt1mm

17 gt 10mm17 gt 10mm

Small angle less

vertical expension

Inverse of above

Halo- energy dependenceHalo- energy dependenceHalo- energy dependenceHalo- energy dependence

Low energy beamLow energy beam

bullLarge energy spread (~1Large energy spread (~1

bullLarge vertical off-setLarge vertical off-set

Halo gt 102m = 30

Halo gt 1 mm = ~ 3

Halo gt 10 mm = ~ 05

Beam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with aperture

1031

Lattice provided by Javier Resta-lopez

octupole octupole

collimatorcollimator

++

spoilersspoilers

Scatt angleScatt angle Gas pressureGas pressure of halo of halo of lost of lost Lost Lost probabilityprobability

File sizeFile size

q = 01q = 01 10 ntorr10 ntorr ~ 132572~ 132572 55 37x1037x10-5-5 13 MB13 MB

q = 001q = 001 1 ntorr1 ntorr ~ 132572~ 132572 00 13 MB13 MB

q = 001q = 001 5 ntorr5 ntorr ~ 8176465~ 8176465 00 796 MB796 MB

q = 001q = 001 10 ntorr10 ntorr ~ 8176465~ 8176465 22 24x1024x10-7-7 796 MB796 MB

q = 0008q = 0008 10 ntorr10 ntorr ~ 20036933~ 20036933 55 25x1025x10-7-7 2 GB2 GB

Electron beam = 1972236 (192 MB)Electron beam = 1972236 (192 MB) lattice V-06-09-01lattice V-06-09-01

halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 1nt 1282543 halo at angle = 001 P = 1nt 1282543 (63 times 1---gt 10 ntorr pressure)(63 times 1---gt 10 ntorr pressure)

---------------------------------------------------------------------------------------------------------------------------------------- halo at angle = 01 P = 10nt 132572 halo at angle = 01 P = 10nt 132572 halo at angle = 005 P = 10nt 531363 halo at angle = 005 P = 10nt 531363 halo at angle = 001 P = 10nt 20036933 halo at angle = 001 P = 10nt 20036933 (150 times 01 (150 times 01 rad---gt rad---gt rad )rad )

Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)

Halo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINAC

bull FullTrackingFullTrackingbull Temperature 300 KTemperature 300 Kbull Pressure 10 ntorrPressure 10 ntorrbull Scattering angle 10nradScattering angle 10nradbull Residual GasResidual Gas

bull Standard PLACET latticeStandard PLACET latticebull Total no of elements 54068Total no of elements 54068

bull No of Quad 1324No of Quad 1324bull No of BPMs 1324No of BPMs 1324

bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 90 GeVLinac injection energy 90 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nradEmitt Along y-axis 10 nrad

LINAC Beamline LINAC Beamline

Energy of the halo particles is increasing Energy of the halo particles is increasing

almost linearly during passing through the almost linearly during passing through the

acceleratoing structures of the LINACacceleratoing structures of the LINAC

PLACET-HTGEN TrackingPLACET-HTGEN Tracking

Several problems pointed out by me and then

fixed immediately by Helmut

Halo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINAC

HorizontalHorizontal

VerticalVertical

Found no loss of halo Found no loss of halo

Beam-gas scattering + Beam-gas scattering +

Bremsstraulung both Bremsstraulung both

processes are contributing processes are contributing

here due to low energy beam here due to low energy beam

at the time of injectionat the time of injection

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Beam profile at the entranceBeam profile at the entranceBeam profile at the entranceBeam profile at the entrance

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Hori

zon

tal an

gle

Hori

zon

tal an

gle

Vert

ical an

gle

Vert

ical an

gle

VerticalVertical

Beam profile in the final quadrupole Beam profile in the final quadrupole Beam profile in the final quadrupole Beam profile in the final quadrupole

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Hori

zon

tal an

gle

Hori

zon

tal an

gle

Vert

ical an

gle

Vert

ical an

gle

VerticalVertical

Halo Phase space plots in final Halo Phase space plots in final quadrupolequadrupole

Halo Phase space plots in final Halo Phase space plots in final quadrupolequadrupole

rad

HorizontalHorizontal

VerticalVertical

VerticalVertical

Placet-htgen simulationPlacet-htgen simulationPlacet-htgen simulationPlacet-htgen simulation

FullTrackingFullTracking

Temperature 300 KTemperature 300 K

Pressure 10 ntorrPressure 10 ntorr

Scattering angle 10 nradScattering angle 10 nrad

Residual Gas (NResidual Gas (N22))

Lattice with no collimatorsLattice with no collimators

PLACET-Development for trackingPLACET-Development for trackingHTGEN for halo generationHTGEN for halo generation

bull Total no of elements 637Total no of elements 637bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 1496 GeVLinac injection energy 1496 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nrad Emitt Along y-axis 10 nrad

Beam coreBeam core

Beam-HaloBeam-Halo

Collimations region Final Focus

Halomdashparticles with large Halomdashparticles with large

betatron amplitudes or with betatron amplitudes or with

large energy off-setslarge energy off-sets

Longitudinal coordinateLongitudinal coordinate

Beam Delivery SystemBeam Delivery System

Beam squeezing leads

the vertical dispersion

Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)

84 gt1mm

17 gt 10mm

53 gt1mm

05 gt 10mm

82 gt1mm

04 gt 10mm

No significant change in vertical halo (above 1mm) as we go from 1-10 ntorrNo significant change in vertical halo (above 1mm) as we go from 1-10 ntorr

Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)

03 gt1mm)03 gt1mm)

0004 gt10mm 0004 gt10mm

62 gt1mm62 gt1mm

04 gt 10mm04 gt 10mm

84 gt1mm84 gt1mm

17 gt 10mm17 gt 10mm

Small angle less

vertical expension

Inverse of above

Halo- energy dependenceHalo- energy dependenceHalo- energy dependenceHalo- energy dependence

Low energy beamLow energy beam

bullLarge energy spread (~1Large energy spread (~1

bullLarge vertical off-setLarge vertical off-set

Halo gt 102m = 30

Halo gt 1 mm = ~ 3

Halo gt 10 mm = ~ 05

Beam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with aperture

1031

Lattice provided by Javier Resta-lopez

octupole octupole

collimatorcollimator

++

spoilersspoilers

Scatt angleScatt angle Gas pressureGas pressure of halo of halo of lost of lost Lost Lost probabilityprobability

File sizeFile size

q = 01q = 01 10 ntorr10 ntorr ~ 132572~ 132572 55 37x1037x10-5-5 13 MB13 MB

q = 001q = 001 1 ntorr1 ntorr ~ 132572~ 132572 00 13 MB13 MB

q = 001q = 001 5 ntorr5 ntorr ~ 8176465~ 8176465 00 796 MB796 MB

q = 001q = 001 10 ntorr10 ntorr ~ 8176465~ 8176465 22 24x1024x10-7-7 796 MB796 MB

q = 0008q = 0008 10 ntorr10 ntorr ~ 20036933~ 20036933 55 25x1025x10-7-7 2 GB2 GB

Electron beam = 1972236 (192 MB)Electron beam = 1972236 (192 MB) lattice V-06-09-01lattice V-06-09-01

halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 1nt 1282543 halo at angle = 001 P = 1nt 1282543 (63 times 1---gt 10 ntorr pressure)(63 times 1---gt 10 ntorr pressure)

---------------------------------------------------------------------------------------------------------------------------------------- halo at angle = 01 P = 10nt 132572 halo at angle = 01 P = 10nt 132572 halo at angle = 005 P = 10nt 531363 halo at angle = 005 P = 10nt 531363 halo at angle = 001 P = 10nt 20036933 halo at angle = 001 P = 10nt 20036933 (150 times 01 (150 times 01 rad---gt rad---gt rad )rad )

Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)

Halo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINAC

bull FullTrackingFullTrackingbull Temperature 300 KTemperature 300 Kbull Pressure 10 ntorrPressure 10 ntorrbull Scattering angle 10nradScattering angle 10nradbull Residual GasResidual Gas

bull Standard PLACET latticeStandard PLACET latticebull Total no of elements 54068Total no of elements 54068

bull No of Quad 1324No of Quad 1324bull No of BPMs 1324No of BPMs 1324

bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 90 GeVLinac injection energy 90 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nradEmitt Along y-axis 10 nrad

LINAC Beamline LINAC Beamline

Energy of the halo particles is increasing Energy of the halo particles is increasing

almost linearly during passing through the almost linearly during passing through the

acceleratoing structures of the LINACacceleratoing structures of the LINAC

PLACET-HTGEN TrackingPLACET-HTGEN Tracking

Several problems pointed out by me and then

fixed immediately by Helmut

Halo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINAC

HorizontalHorizontal

VerticalVertical

Found no loss of halo Found no loss of halo

Beam-gas scattering + Beam-gas scattering +

Bremsstraulung both Bremsstraulung both

processes are contributing processes are contributing

here due to low energy beam here due to low energy beam

at the time of injectionat the time of injection

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Beam profile in the final quadrupole Beam profile in the final quadrupole Beam profile in the final quadrupole Beam profile in the final quadrupole

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Hori

zon

tal an

gle

Hori

zon

tal an

gle

Vert

ical an

gle

Vert

ical an

gle

VerticalVertical

Halo Phase space plots in final Halo Phase space plots in final quadrupolequadrupole

Halo Phase space plots in final Halo Phase space plots in final quadrupolequadrupole

rad

HorizontalHorizontal

VerticalVertical

VerticalVertical

Placet-htgen simulationPlacet-htgen simulationPlacet-htgen simulationPlacet-htgen simulation

FullTrackingFullTracking

Temperature 300 KTemperature 300 K

Pressure 10 ntorrPressure 10 ntorr

Scattering angle 10 nradScattering angle 10 nrad

Residual Gas (NResidual Gas (N22))

Lattice with no collimatorsLattice with no collimators

PLACET-Development for trackingPLACET-Development for trackingHTGEN for halo generationHTGEN for halo generation

bull Total no of elements 637Total no of elements 637bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 1496 GeVLinac injection energy 1496 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nrad Emitt Along y-axis 10 nrad

Beam coreBeam core

Beam-HaloBeam-Halo

Collimations region Final Focus

Halomdashparticles with large Halomdashparticles with large

betatron amplitudes or with betatron amplitudes or with

large energy off-setslarge energy off-sets

Longitudinal coordinateLongitudinal coordinate

Beam Delivery SystemBeam Delivery System

Beam squeezing leads

the vertical dispersion

Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)

84 gt1mm

17 gt 10mm

53 gt1mm

05 gt 10mm

82 gt1mm

04 gt 10mm

No significant change in vertical halo (above 1mm) as we go from 1-10 ntorrNo significant change in vertical halo (above 1mm) as we go from 1-10 ntorr

Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)

03 gt1mm)03 gt1mm)

0004 gt10mm 0004 gt10mm

62 gt1mm62 gt1mm

04 gt 10mm04 gt 10mm

84 gt1mm84 gt1mm

17 gt 10mm17 gt 10mm

Small angle less

vertical expension

Inverse of above

Halo- energy dependenceHalo- energy dependenceHalo- energy dependenceHalo- energy dependence

Low energy beamLow energy beam

bullLarge energy spread (~1Large energy spread (~1

bullLarge vertical off-setLarge vertical off-set

Halo gt 102m = 30

Halo gt 1 mm = ~ 3

Halo gt 10 mm = ~ 05

Beam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with aperture

1031

Lattice provided by Javier Resta-lopez

octupole octupole

collimatorcollimator

++

spoilersspoilers

Scatt angleScatt angle Gas pressureGas pressure of halo of halo of lost of lost Lost Lost probabilityprobability

File sizeFile size

q = 01q = 01 10 ntorr10 ntorr ~ 132572~ 132572 55 37x1037x10-5-5 13 MB13 MB

q = 001q = 001 1 ntorr1 ntorr ~ 132572~ 132572 00 13 MB13 MB

q = 001q = 001 5 ntorr5 ntorr ~ 8176465~ 8176465 00 796 MB796 MB

q = 001q = 001 10 ntorr10 ntorr ~ 8176465~ 8176465 22 24x1024x10-7-7 796 MB796 MB

q = 0008q = 0008 10 ntorr10 ntorr ~ 20036933~ 20036933 55 25x1025x10-7-7 2 GB2 GB

Electron beam = 1972236 (192 MB)Electron beam = 1972236 (192 MB) lattice V-06-09-01lattice V-06-09-01

halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 1nt 1282543 halo at angle = 001 P = 1nt 1282543 (63 times 1---gt 10 ntorr pressure)(63 times 1---gt 10 ntorr pressure)

---------------------------------------------------------------------------------------------------------------------------------------- halo at angle = 01 P = 10nt 132572 halo at angle = 01 P = 10nt 132572 halo at angle = 005 P = 10nt 531363 halo at angle = 005 P = 10nt 531363 halo at angle = 001 P = 10nt 20036933 halo at angle = 001 P = 10nt 20036933 (150 times 01 (150 times 01 rad---gt rad---gt rad )rad )

Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)

Halo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINAC

bull FullTrackingFullTrackingbull Temperature 300 KTemperature 300 Kbull Pressure 10 ntorrPressure 10 ntorrbull Scattering angle 10nradScattering angle 10nradbull Residual GasResidual Gas

bull Standard PLACET latticeStandard PLACET latticebull Total no of elements 54068Total no of elements 54068

bull No of Quad 1324No of Quad 1324bull No of BPMs 1324No of BPMs 1324

bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 90 GeVLinac injection energy 90 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nradEmitt Along y-axis 10 nrad

LINAC Beamline LINAC Beamline

Energy of the halo particles is increasing Energy of the halo particles is increasing

almost linearly during passing through the almost linearly during passing through the

acceleratoing structures of the LINACacceleratoing structures of the LINAC

PLACET-HTGEN TrackingPLACET-HTGEN Tracking

Several problems pointed out by me and then

fixed immediately by Helmut

Halo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINAC

HorizontalHorizontal

VerticalVertical

Found no loss of halo Found no loss of halo

Beam-gas scattering + Beam-gas scattering +

Bremsstraulung both Bremsstraulung both

processes are contributing processes are contributing

here due to low energy beam here due to low energy beam

at the time of injectionat the time of injection

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Halo Phase space plots in final Halo Phase space plots in final quadrupolequadrupole

Halo Phase space plots in final Halo Phase space plots in final quadrupolequadrupole

rad

HorizontalHorizontal

VerticalVertical

VerticalVertical

Placet-htgen simulationPlacet-htgen simulationPlacet-htgen simulationPlacet-htgen simulation

FullTrackingFullTracking

Temperature 300 KTemperature 300 K

Pressure 10 ntorrPressure 10 ntorr

Scattering angle 10 nradScattering angle 10 nrad

Residual Gas (NResidual Gas (N22))

Lattice with no collimatorsLattice with no collimators

PLACET-Development for trackingPLACET-Development for trackingHTGEN for halo generationHTGEN for halo generation

bull Total no of elements 637Total no of elements 637bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 1496 GeVLinac injection energy 1496 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nrad Emitt Along y-axis 10 nrad

Beam coreBeam core

Beam-HaloBeam-Halo

Collimations region Final Focus

Halomdashparticles with large Halomdashparticles with large

betatron amplitudes or with betatron amplitudes or with

large energy off-setslarge energy off-sets

Longitudinal coordinateLongitudinal coordinate

Beam Delivery SystemBeam Delivery System

Beam squeezing leads

the vertical dispersion

Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)

84 gt1mm

17 gt 10mm

53 gt1mm

05 gt 10mm

82 gt1mm

04 gt 10mm

No significant change in vertical halo (above 1mm) as we go from 1-10 ntorrNo significant change in vertical halo (above 1mm) as we go from 1-10 ntorr

Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)

03 gt1mm)03 gt1mm)

0004 gt10mm 0004 gt10mm

62 gt1mm62 gt1mm

04 gt 10mm04 gt 10mm

84 gt1mm84 gt1mm

17 gt 10mm17 gt 10mm

Small angle less

vertical expension

Inverse of above

Halo- energy dependenceHalo- energy dependenceHalo- energy dependenceHalo- energy dependence

Low energy beamLow energy beam

bullLarge energy spread (~1Large energy spread (~1

bullLarge vertical off-setLarge vertical off-set

Halo gt 102m = 30

Halo gt 1 mm = ~ 3

Halo gt 10 mm = ~ 05

Beam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with aperture

1031

Lattice provided by Javier Resta-lopez

octupole octupole

collimatorcollimator

++

spoilersspoilers

Scatt angleScatt angle Gas pressureGas pressure of halo of halo of lost of lost Lost Lost probabilityprobability

File sizeFile size

q = 01q = 01 10 ntorr10 ntorr ~ 132572~ 132572 55 37x1037x10-5-5 13 MB13 MB

q = 001q = 001 1 ntorr1 ntorr ~ 132572~ 132572 00 13 MB13 MB

q = 001q = 001 5 ntorr5 ntorr ~ 8176465~ 8176465 00 796 MB796 MB

q = 001q = 001 10 ntorr10 ntorr ~ 8176465~ 8176465 22 24x1024x10-7-7 796 MB796 MB

q = 0008q = 0008 10 ntorr10 ntorr ~ 20036933~ 20036933 55 25x1025x10-7-7 2 GB2 GB

Electron beam = 1972236 (192 MB)Electron beam = 1972236 (192 MB) lattice V-06-09-01lattice V-06-09-01

halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 1nt 1282543 halo at angle = 001 P = 1nt 1282543 (63 times 1---gt 10 ntorr pressure)(63 times 1---gt 10 ntorr pressure)

---------------------------------------------------------------------------------------------------------------------------------------- halo at angle = 01 P = 10nt 132572 halo at angle = 01 P = 10nt 132572 halo at angle = 005 P = 10nt 531363 halo at angle = 005 P = 10nt 531363 halo at angle = 001 P = 10nt 20036933 halo at angle = 001 P = 10nt 20036933 (150 times 01 (150 times 01 rad---gt rad---gt rad )rad )

Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)

Halo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINAC

bull FullTrackingFullTrackingbull Temperature 300 KTemperature 300 Kbull Pressure 10 ntorrPressure 10 ntorrbull Scattering angle 10nradScattering angle 10nradbull Residual GasResidual Gas

bull Standard PLACET latticeStandard PLACET latticebull Total no of elements 54068Total no of elements 54068

bull No of Quad 1324No of Quad 1324bull No of BPMs 1324No of BPMs 1324

bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 90 GeVLinac injection energy 90 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nradEmitt Along y-axis 10 nrad

LINAC Beamline LINAC Beamline

Energy of the halo particles is increasing Energy of the halo particles is increasing

almost linearly during passing through the almost linearly during passing through the

acceleratoing structures of the LINACacceleratoing structures of the LINAC

PLACET-HTGEN TrackingPLACET-HTGEN Tracking

Several problems pointed out by me and then

fixed immediately by Helmut

Halo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINAC

HorizontalHorizontal

VerticalVertical

Found no loss of halo Found no loss of halo

Beam-gas scattering + Beam-gas scattering +

Bremsstraulung both Bremsstraulung both

processes are contributing processes are contributing

here due to low energy beam here due to low energy beam

at the time of injectionat the time of injection

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Placet-htgen simulationPlacet-htgen simulationPlacet-htgen simulationPlacet-htgen simulation

FullTrackingFullTracking

Temperature 300 KTemperature 300 K

Pressure 10 ntorrPressure 10 ntorr

Scattering angle 10 nradScattering angle 10 nrad

Residual Gas (NResidual Gas (N22))

Lattice with no collimatorsLattice with no collimators

PLACET-Development for trackingPLACET-Development for trackingHTGEN for halo generationHTGEN for halo generation

bull Total no of elements 637Total no of elements 637bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 1496 GeVLinac injection energy 1496 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nrad Emitt Along y-axis 10 nrad

Beam coreBeam core

Beam-HaloBeam-Halo

Collimations region Final Focus

Halomdashparticles with large Halomdashparticles with large

betatron amplitudes or with betatron amplitudes or with

large energy off-setslarge energy off-sets

Longitudinal coordinateLongitudinal coordinate

Beam Delivery SystemBeam Delivery System

Beam squeezing leads

the vertical dispersion

Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)

84 gt1mm

17 gt 10mm

53 gt1mm

05 gt 10mm

82 gt1mm

04 gt 10mm

No significant change in vertical halo (above 1mm) as we go from 1-10 ntorrNo significant change in vertical halo (above 1mm) as we go from 1-10 ntorr

Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)

03 gt1mm)03 gt1mm)

0004 gt10mm 0004 gt10mm

62 gt1mm62 gt1mm

04 gt 10mm04 gt 10mm

84 gt1mm84 gt1mm

17 gt 10mm17 gt 10mm

Small angle less

vertical expension

Inverse of above

Halo- energy dependenceHalo- energy dependenceHalo- energy dependenceHalo- energy dependence

Low energy beamLow energy beam

bullLarge energy spread (~1Large energy spread (~1

bullLarge vertical off-setLarge vertical off-set

Halo gt 102m = 30

Halo gt 1 mm = ~ 3

Halo gt 10 mm = ~ 05

Beam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with aperture

1031

Lattice provided by Javier Resta-lopez

octupole octupole

collimatorcollimator

++

spoilersspoilers

Scatt angleScatt angle Gas pressureGas pressure of halo of halo of lost of lost Lost Lost probabilityprobability

File sizeFile size

q = 01q = 01 10 ntorr10 ntorr ~ 132572~ 132572 55 37x1037x10-5-5 13 MB13 MB

q = 001q = 001 1 ntorr1 ntorr ~ 132572~ 132572 00 13 MB13 MB

q = 001q = 001 5 ntorr5 ntorr ~ 8176465~ 8176465 00 796 MB796 MB

q = 001q = 001 10 ntorr10 ntorr ~ 8176465~ 8176465 22 24x1024x10-7-7 796 MB796 MB

q = 0008q = 0008 10 ntorr10 ntorr ~ 20036933~ 20036933 55 25x1025x10-7-7 2 GB2 GB

Electron beam = 1972236 (192 MB)Electron beam = 1972236 (192 MB) lattice V-06-09-01lattice V-06-09-01

halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 1nt 1282543 halo at angle = 001 P = 1nt 1282543 (63 times 1---gt 10 ntorr pressure)(63 times 1---gt 10 ntorr pressure)

---------------------------------------------------------------------------------------------------------------------------------------- halo at angle = 01 P = 10nt 132572 halo at angle = 01 P = 10nt 132572 halo at angle = 005 P = 10nt 531363 halo at angle = 005 P = 10nt 531363 halo at angle = 001 P = 10nt 20036933 halo at angle = 001 P = 10nt 20036933 (150 times 01 (150 times 01 rad---gt rad---gt rad )rad )

Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)

Halo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINAC

bull FullTrackingFullTrackingbull Temperature 300 KTemperature 300 Kbull Pressure 10 ntorrPressure 10 ntorrbull Scattering angle 10nradScattering angle 10nradbull Residual GasResidual Gas

bull Standard PLACET latticeStandard PLACET latticebull Total no of elements 54068Total no of elements 54068

bull No of Quad 1324No of Quad 1324bull No of BPMs 1324No of BPMs 1324

bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 90 GeVLinac injection energy 90 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nradEmitt Along y-axis 10 nrad

LINAC Beamline LINAC Beamline

Energy of the halo particles is increasing Energy of the halo particles is increasing

almost linearly during passing through the almost linearly during passing through the

acceleratoing structures of the LINACacceleratoing structures of the LINAC

PLACET-HTGEN TrackingPLACET-HTGEN Tracking

Several problems pointed out by me and then

fixed immediately by Helmut

Halo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINAC

HorizontalHorizontal

VerticalVertical

Found no loss of halo Found no loss of halo

Beam-gas scattering + Beam-gas scattering +

Bremsstraulung both Bremsstraulung both

processes are contributing processes are contributing

here due to low energy beam here due to low energy beam

at the time of injectionat the time of injection

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Beam coreBeam core

Beam-HaloBeam-Halo

Collimations region Final Focus

Halomdashparticles with large Halomdashparticles with large

betatron amplitudes or with betatron amplitudes or with

large energy off-setslarge energy off-sets

Longitudinal coordinateLongitudinal coordinate

Beam Delivery SystemBeam Delivery System

Beam squeezing leads

the vertical dispersion

Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)

84 gt1mm

17 gt 10mm

53 gt1mm

05 gt 10mm

82 gt1mm

04 gt 10mm

No significant change in vertical halo (above 1mm) as we go from 1-10 ntorrNo significant change in vertical halo (above 1mm) as we go from 1-10 ntorr

Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)

03 gt1mm)03 gt1mm)

0004 gt10mm 0004 gt10mm

62 gt1mm62 gt1mm

04 gt 10mm04 gt 10mm

84 gt1mm84 gt1mm

17 gt 10mm17 gt 10mm

Small angle less

vertical expension

Inverse of above

Halo- energy dependenceHalo- energy dependenceHalo- energy dependenceHalo- energy dependence

Low energy beamLow energy beam

bullLarge energy spread (~1Large energy spread (~1

bullLarge vertical off-setLarge vertical off-set

Halo gt 102m = 30

Halo gt 1 mm = ~ 3

Halo gt 10 mm = ~ 05

Beam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with aperture

1031

Lattice provided by Javier Resta-lopez

octupole octupole

collimatorcollimator

++

spoilersspoilers

Scatt angleScatt angle Gas pressureGas pressure of halo of halo of lost of lost Lost Lost probabilityprobability

File sizeFile size

q = 01q = 01 10 ntorr10 ntorr ~ 132572~ 132572 55 37x1037x10-5-5 13 MB13 MB

q = 001q = 001 1 ntorr1 ntorr ~ 132572~ 132572 00 13 MB13 MB

q = 001q = 001 5 ntorr5 ntorr ~ 8176465~ 8176465 00 796 MB796 MB

q = 001q = 001 10 ntorr10 ntorr ~ 8176465~ 8176465 22 24x1024x10-7-7 796 MB796 MB

q = 0008q = 0008 10 ntorr10 ntorr ~ 20036933~ 20036933 55 25x1025x10-7-7 2 GB2 GB

Electron beam = 1972236 (192 MB)Electron beam = 1972236 (192 MB) lattice V-06-09-01lattice V-06-09-01

halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 1nt 1282543 halo at angle = 001 P = 1nt 1282543 (63 times 1---gt 10 ntorr pressure)(63 times 1---gt 10 ntorr pressure)

---------------------------------------------------------------------------------------------------------------------------------------- halo at angle = 01 P = 10nt 132572 halo at angle = 01 P = 10nt 132572 halo at angle = 005 P = 10nt 531363 halo at angle = 005 P = 10nt 531363 halo at angle = 001 P = 10nt 20036933 halo at angle = 001 P = 10nt 20036933 (150 times 01 (150 times 01 rad---gt rad---gt rad )rad )

Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)

Halo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINAC

bull FullTrackingFullTrackingbull Temperature 300 KTemperature 300 Kbull Pressure 10 ntorrPressure 10 ntorrbull Scattering angle 10nradScattering angle 10nradbull Residual GasResidual Gas

bull Standard PLACET latticeStandard PLACET latticebull Total no of elements 54068Total no of elements 54068

bull No of Quad 1324No of Quad 1324bull No of BPMs 1324No of BPMs 1324

bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 90 GeVLinac injection energy 90 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nradEmitt Along y-axis 10 nrad

LINAC Beamline LINAC Beamline

Energy of the halo particles is increasing Energy of the halo particles is increasing

almost linearly during passing through the almost linearly during passing through the

acceleratoing structures of the LINACacceleratoing structures of the LINAC

PLACET-HTGEN TrackingPLACET-HTGEN Tracking

Several problems pointed out by me and then

fixed immediately by Helmut

Halo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINAC

HorizontalHorizontal

VerticalVertical

Found no loss of halo Found no loss of halo

Beam-gas scattering + Beam-gas scattering +

Bremsstraulung both Bremsstraulung both

processes are contributing processes are contributing

here due to low energy beam here due to low energy beam

at the time of injectionat the time of injection

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)Beam-Halo (Residual Gas pressure dependence)

84 gt1mm

17 gt 10mm

53 gt1mm

05 gt 10mm

82 gt1mm

04 gt 10mm

No significant change in vertical halo (above 1mm) as we go from 1-10 ntorrNo significant change in vertical halo (above 1mm) as we go from 1-10 ntorr

Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)

03 gt1mm)03 gt1mm)

0004 gt10mm 0004 gt10mm

62 gt1mm62 gt1mm

04 gt 10mm04 gt 10mm

84 gt1mm84 gt1mm

17 gt 10mm17 gt 10mm

Small angle less

vertical expension

Inverse of above

Halo- energy dependenceHalo- energy dependenceHalo- energy dependenceHalo- energy dependence

Low energy beamLow energy beam

bullLarge energy spread (~1Large energy spread (~1

bullLarge vertical off-setLarge vertical off-set

Halo gt 102m = 30

Halo gt 1 mm = ~ 3

Halo gt 10 mm = ~ 05

Beam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with aperture

1031

Lattice provided by Javier Resta-lopez

octupole octupole

collimatorcollimator

++

spoilersspoilers

Scatt angleScatt angle Gas pressureGas pressure of halo of halo of lost of lost Lost Lost probabilityprobability

File sizeFile size

q = 01q = 01 10 ntorr10 ntorr ~ 132572~ 132572 55 37x1037x10-5-5 13 MB13 MB

q = 001q = 001 1 ntorr1 ntorr ~ 132572~ 132572 00 13 MB13 MB

q = 001q = 001 5 ntorr5 ntorr ~ 8176465~ 8176465 00 796 MB796 MB

q = 001q = 001 10 ntorr10 ntorr ~ 8176465~ 8176465 22 24x1024x10-7-7 796 MB796 MB

q = 0008q = 0008 10 ntorr10 ntorr ~ 20036933~ 20036933 55 25x1025x10-7-7 2 GB2 GB

Electron beam = 1972236 (192 MB)Electron beam = 1972236 (192 MB) lattice V-06-09-01lattice V-06-09-01

halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 1nt 1282543 halo at angle = 001 P = 1nt 1282543 (63 times 1---gt 10 ntorr pressure)(63 times 1---gt 10 ntorr pressure)

---------------------------------------------------------------------------------------------------------------------------------------- halo at angle = 01 P = 10nt 132572 halo at angle = 01 P = 10nt 132572 halo at angle = 005 P = 10nt 531363 halo at angle = 005 P = 10nt 531363 halo at angle = 001 P = 10nt 20036933 halo at angle = 001 P = 10nt 20036933 (150 times 01 (150 times 01 rad---gt rad---gt rad )rad )

Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)

Halo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINAC

bull FullTrackingFullTrackingbull Temperature 300 KTemperature 300 Kbull Pressure 10 ntorrPressure 10 ntorrbull Scattering angle 10nradScattering angle 10nradbull Residual GasResidual Gas

bull Standard PLACET latticeStandard PLACET latticebull Total no of elements 54068Total no of elements 54068

bull No of Quad 1324No of Quad 1324bull No of BPMs 1324No of BPMs 1324

bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 90 GeVLinac injection energy 90 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nradEmitt Along y-axis 10 nrad

LINAC Beamline LINAC Beamline

Energy of the halo particles is increasing Energy of the halo particles is increasing

almost linearly during passing through the almost linearly during passing through the

acceleratoing structures of the LINACacceleratoing structures of the LINAC

PLACET-HTGEN TrackingPLACET-HTGEN Tracking

Several problems pointed out by me and then

fixed immediately by Helmut

Halo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINAC

HorizontalHorizontal

VerticalVertical

Found no loss of halo Found no loss of halo

Beam-gas scattering + Beam-gas scattering +

Bremsstraulung both Bremsstraulung both

processes are contributing processes are contributing

here due to low energy beam here due to low energy beam

at the time of injectionat the time of injection

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)Beam-Halo (scattering angle dependence)

03 gt1mm)03 gt1mm)

0004 gt10mm 0004 gt10mm

62 gt1mm62 gt1mm

04 gt 10mm04 gt 10mm

84 gt1mm84 gt1mm

17 gt 10mm17 gt 10mm

Small angle less

vertical expension

Inverse of above

Halo- energy dependenceHalo- energy dependenceHalo- energy dependenceHalo- energy dependence

Low energy beamLow energy beam

bullLarge energy spread (~1Large energy spread (~1

bullLarge vertical off-setLarge vertical off-set

Halo gt 102m = 30

Halo gt 1 mm = ~ 3

Halo gt 10 mm = ~ 05

Beam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with aperture

1031

Lattice provided by Javier Resta-lopez

octupole octupole

collimatorcollimator

++

spoilersspoilers

Scatt angleScatt angle Gas pressureGas pressure of halo of halo of lost of lost Lost Lost probabilityprobability

File sizeFile size

q = 01q = 01 10 ntorr10 ntorr ~ 132572~ 132572 55 37x1037x10-5-5 13 MB13 MB

q = 001q = 001 1 ntorr1 ntorr ~ 132572~ 132572 00 13 MB13 MB

q = 001q = 001 5 ntorr5 ntorr ~ 8176465~ 8176465 00 796 MB796 MB

q = 001q = 001 10 ntorr10 ntorr ~ 8176465~ 8176465 22 24x1024x10-7-7 796 MB796 MB

q = 0008q = 0008 10 ntorr10 ntorr ~ 20036933~ 20036933 55 25x1025x10-7-7 2 GB2 GB

Electron beam = 1972236 (192 MB)Electron beam = 1972236 (192 MB) lattice V-06-09-01lattice V-06-09-01

halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 1nt 1282543 halo at angle = 001 P = 1nt 1282543 (63 times 1---gt 10 ntorr pressure)(63 times 1---gt 10 ntorr pressure)

---------------------------------------------------------------------------------------------------------------------------------------- halo at angle = 01 P = 10nt 132572 halo at angle = 01 P = 10nt 132572 halo at angle = 005 P = 10nt 531363 halo at angle = 005 P = 10nt 531363 halo at angle = 001 P = 10nt 20036933 halo at angle = 001 P = 10nt 20036933 (150 times 01 (150 times 01 rad---gt rad---gt rad )rad )

Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)

Halo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINAC

bull FullTrackingFullTrackingbull Temperature 300 KTemperature 300 Kbull Pressure 10 ntorrPressure 10 ntorrbull Scattering angle 10nradScattering angle 10nradbull Residual GasResidual Gas

bull Standard PLACET latticeStandard PLACET latticebull Total no of elements 54068Total no of elements 54068

bull No of Quad 1324No of Quad 1324bull No of BPMs 1324No of BPMs 1324

bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 90 GeVLinac injection energy 90 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nradEmitt Along y-axis 10 nrad

LINAC Beamline LINAC Beamline

Energy of the halo particles is increasing Energy of the halo particles is increasing

almost linearly during passing through the almost linearly during passing through the

acceleratoing structures of the LINACacceleratoing structures of the LINAC

PLACET-HTGEN TrackingPLACET-HTGEN Tracking

Several problems pointed out by me and then

fixed immediately by Helmut

Halo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINAC

HorizontalHorizontal

VerticalVertical

Found no loss of halo Found no loss of halo

Beam-gas scattering + Beam-gas scattering +

Bremsstraulung both Bremsstraulung both

processes are contributing processes are contributing

here due to low energy beam here due to low energy beam

at the time of injectionat the time of injection

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Halo- energy dependenceHalo- energy dependenceHalo- energy dependenceHalo- energy dependence

Low energy beamLow energy beam

bullLarge energy spread (~1Large energy spread (~1

bullLarge vertical off-setLarge vertical off-set

Halo gt 102m = 30

Halo gt 1 mm = ~ 3

Halo gt 10 mm = ~ 05

Beam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with aperture

1031

Lattice provided by Javier Resta-lopez

octupole octupole

collimatorcollimator

++

spoilersspoilers

Scatt angleScatt angle Gas pressureGas pressure of halo of halo of lost of lost Lost Lost probabilityprobability

File sizeFile size

q = 01q = 01 10 ntorr10 ntorr ~ 132572~ 132572 55 37x1037x10-5-5 13 MB13 MB

q = 001q = 001 1 ntorr1 ntorr ~ 132572~ 132572 00 13 MB13 MB

q = 001q = 001 5 ntorr5 ntorr ~ 8176465~ 8176465 00 796 MB796 MB

q = 001q = 001 10 ntorr10 ntorr ~ 8176465~ 8176465 22 24x1024x10-7-7 796 MB796 MB

q = 0008q = 0008 10 ntorr10 ntorr ~ 20036933~ 20036933 55 25x1025x10-7-7 2 GB2 GB

Electron beam = 1972236 (192 MB)Electron beam = 1972236 (192 MB) lattice V-06-09-01lattice V-06-09-01

halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 1nt 1282543 halo at angle = 001 P = 1nt 1282543 (63 times 1---gt 10 ntorr pressure)(63 times 1---gt 10 ntorr pressure)

---------------------------------------------------------------------------------------------------------------------------------------- halo at angle = 01 P = 10nt 132572 halo at angle = 01 P = 10nt 132572 halo at angle = 005 P = 10nt 531363 halo at angle = 005 P = 10nt 531363 halo at angle = 001 P = 10nt 20036933 halo at angle = 001 P = 10nt 20036933 (150 times 01 (150 times 01 rad---gt rad---gt rad )rad )

Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)

Halo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINAC

bull FullTrackingFullTrackingbull Temperature 300 KTemperature 300 Kbull Pressure 10 ntorrPressure 10 ntorrbull Scattering angle 10nradScattering angle 10nradbull Residual GasResidual Gas

bull Standard PLACET latticeStandard PLACET latticebull Total no of elements 54068Total no of elements 54068

bull No of Quad 1324No of Quad 1324bull No of BPMs 1324No of BPMs 1324

bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 90 GeVLinac injection energy 90 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nradEmitt Along y-axis 10 nrad

LINAC Beamline LINAC Beamline

Energy of the halo particles is increasing Energy of the halo particles is increasing

almost linearly during passing through the almost linearly during passing through the

acceleratoing structures of the LINACacceleratoing structures of the LINAC

PLACET-HTGEN TrackingPLACET-HTGEN Tracking

Several problems pointed out by me and then

fixed immediately by Helmut

Halo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINAC

HorizontalHorizontal

VerticalVertical

Found no loss of halo Found no loss of halo

Beam-gas scattering + Beam-gas scattering +

Bremsstraulung both Bremsstraulung both

processes are contributing processes are contributing

here due to low energy beam here due to low energy beam

at the time of injectionat the time of injection

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Halo gt 102m = 30

Halo gt 1 mm = ~ 3

Halo gt 10 mm = ~ 05

Beam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with apertureBeam and Halo Profile with aperture

1031

Lattice provided by Javier Resta-lopez

octupole octupole

collimatorcollimator

++

spoilersspoilers

Scatt angleScatt angle Gas pressureGas pressure of halo of halo of lost of lost Lost Lost probabilityprobability

File sizeFile size

q = 01q = 01 10 ntorr10 ntorr ~ 132572~ 132572 55 37x1037x10-5-5 13 MB13 MB

q = 001q = 001 1 ntorr1 ntorr ~ 132572~ 132572 00 13 MB13 MB

q = 001q = 001 5 ntorr5 ntorr ~ 8176465~ 8176465 00 796 MB796 MB

q = 001q = 001 10 ntorr10 ntorr ~ 8176465~ 8176465 22 24x1024x10-7-7 796 MB796 MB

q = 0008q = 0008 10 ntorr10 ntorr ~ 20036933~ 20036933 55 25x1025x10-7-7 2 GB2 GB

Electron beam = 1972236 (192 MB)Electron beam = 1972236 (192 MB) lattice V-06-09-01lattice V-06-09-01

halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 1nt 1282543 halo at angle = 001 P = 1nt 1282543 (63 times 1---gt 10 ntorr pressure)(63 times 1---gt 10 ntorr pressure)

---------------------------------------------------------------------------------------------------------------------------------------- halo at angle = 01 P = 10nt 132572 halo at angle = 01 P = 10nt 132572 halo at angle = 005 P = 10nt 531363 halo at angle = 005 P = 10nt 531363 halo at angle = 001 P = 10nt 20036933 halo at angle = 001 P = 10nt 20036933 (150 times 01 (150 times 01 rad---gt rad---gt rad )rad )

Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)

Halo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINAC

bull FullTrackingFullTrackingbull Temperature 300 KTemperature 300 Kbull Pressure 10 ntorrPressure 10 ntorrbull Scattering angle 10nradScattering angle 10nradbull Residual GasResidual Gas

bull Standard PLACET latticeStandard PLACET latticebull Total no of elements 54068Total no of elements 54068

bull No of Quad 1324No of Quad 1324bull No of BPMs 1324No of BPMs 1324

bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 90 GeVLinac injection energy 90 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nradEmitt Along y-axis 10 nrad

LINAC Beamline LINAC Beamline

Energy of the halo particles is increasing Energy of the halo particles is increasing

almost linearly during passing through the almost linearly during passing through the

acceleratoing structures of the LINACacceleratoing structures of the LINAC

PLACET-HTGEN TrackingPLACET-HTGEN Tracking

Several problems pointed out by me and then

fixed immediately by Helmut

Halo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINAC

HorizontalHorizontal

VerticalVertical

Found no loss of halo Found no loss of halo

Beam-gas scattering + Beam-gas scattering +

Bremsstraulung both Bremsstraulung both

processes are contributing processes are contributing

here due to low energy beam here due to low energy beam

at the time of injectionat the time of injection

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Scatt angleScatt angle Gas pressureGas pressure of halo of halo of lost of lost Lost Lost probabilityprobability

File sizeFile size

q = 01q = 01 10 ntorr10 ntorr ~ 132572~ 132572 55 37x1037x10-5-5 13 MB13 MB

q = 001q = 001 1 ntorr1 ntorr ~ 132572~ 132572 00 13 MB13 MB

q = 001q = 001 5 ntorr5 ntorr ~ 8176465~ 8176465 00 796 MB796 MB

q = 001q = 001 10 ntorr10 ntorr ~ 8176465~ 8176465 22 24x1024x10-7-7 796 MB796 MB

q = 0008q = 0008 10 ntorr10 ntorr ~ 20036933~ 20036933 55 25x1025x10-7-7 2 GB2 GB

Electron beam = 1972236 (192 MB)Electron beam = 1972236 (192 MB) lattice V-06-09-01lattice V-06-09-01

halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 10nt 8176465 ratio 10nt5nt==128 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 5nt 6382848 ratio 5nt1nt== 5 halo at angle = 001 P = 1nt 1282543 halo at angle = 001 P = 1nt 1282543 (63 times 1---gt 10 ntorr pressure)(63 times 1---gt 10 ntorr pressure)

---------------------------------------------------------------------------------------------------------------------------------------- halo at angle = 01 P = 10nt 132572 halo at angle = 01 P = 10nt 132572 halo at angle = 005 P = 10nt 531363 halo at angle = 005 P = 10nt 531363 halo at angle = 001 P = 10nt 20036933 halo at angle = 001 P = 10nt 20036933 (150 times 01 (150 times 01 rad---gt rad---gt rad )rad )

Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)Halo Statistics (BDS)

Halo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINAC

bull FullTrackingFullTrackingbull Temperature 300 KTemperature 300 Kbull Pressure 10 ntorrPressure 10 ntorrbull Scattering angle 10nradScattering angle 10nradbull Residual GasResidual Gas

bull Standard PLACET latticeStandard PLACET latticebull Total no of elements 54068Total no of elements 54068

bull No of Quad 1324No of Quad 1324bull No of BPMs 1324No of BPMs 1324

bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 90 GeVLinac injection energy 90 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nradEmitt Along y-axis 10 nrad

LINAC Beamline LINAC Beamline

Energy of the halo particles is increasing Energy of the halo particles is increasing

almost linearly during passing through the almost linearly during passing through the

acceleratoing structures of the LINACacceleratoing structures of the LINAC

PLACET-HTGEN TrackingPLACET-HTGEN Tracking

Several problems pointed out by me and then

fixed immediately by Helmut

Halo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINAC

HorizontalHorizontal

VerticalVertical

Found no loss of halo Found no loss of halo

Beam-gas scattering + Beam-gas scattering +

Bremsstraulung both Bremsstraulung both

processes are contributing processes are contributing

here due to low energy beam here due to low energy beam

at the time of injectionat the time of injection

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Halo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINACHalo Distributions in LINAC

bull FullTrackingFullTrackingbull Temperature 300 KTemperature 300 Kbull Pressure 10 ntorrPressure 10 ntorrbull Scattering angle 10nradScattering angle 10nradbull Residual GasResidual Gas

bull Standard PLACET latticeStandard PLACET latticebull Total no of elements 54068Total no of elements 54068

bull No of Quad 1324No of Quad 1324bull No of BPMs 1324No of BPMs 1324

bull No of slices 31No of slices 31bull No of macroparticles 100No of macroparticles 100bull Linac injection energy 90 GeVLinac injection energy 90 GeVbull Charge 4 nCCharge 4 nCbull Emitt along x-axis 680 nradEmitt along x-axis 680 nradbull Emitt Along y-axis 10 nradEmitt Along y-axis 10 nrad

LINAC Beamline LINAC Beamline

Energy of the halo particles is increasing Energy of the halo particles is increasing

almost linearly during passing through the almost linearly during passing through the

acceleratoing structures of the LINACacceleratoing structures of the LINAC

PLACET-HTGEN TrackingPLACET-HTGEN Tracking

Several problems pointed out by me and then

fixed immediately by Helmut

Halo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINAC

HorizontalHorizontal

VerticalVertical

Found no loss of halo Found no loss of halo

Beam-gas scattering + Beam-gas scattering +

Bremsstraulung both Bremsstraulung both

processes are contributing processes are contributing

here due to low energy beam here due to low energy beam

at the time of injectionat the time of injection

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Halo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINACHalo spectrum in LINAC

HorizontalHorizontal

VerticalVertical

Found no loss of halo Found no loss of halo

Beam-gas scattering + Beam-gas scattering +

Bremsstraulung both Bremsstraulung both

processes are contributing processes are contributing

here due to low energy beam here due to low energy beam

at the time of injectionat the time of injection

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Found no loss of halo Found no loss of halo

Beam-gas scattering + Beam-gas scattering +

Bremsstraulung both Bremsstraulung both

processes are contributing processes are contributing

here due to low energy beam here due to low energy beam

at the time of injectionat the time of injection

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Halo in Post collision lineHalo in Post collision lineHalo in Post collision lineHalo in Post collision line

Halo and beam looks same so halo are Halo and beam looks same so halo are

not so important for extraction line but not so important for extraction line but

beam distributions countbeam distributions count

PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP PLACET-HTGEN Tracking input from GUINEA-PIG (Beam-Beam effects at IP

soon will be presented)soon will be presented)

Lattice used contains only driftsLattice used contains only drifts

With no collimatorsWith no collimators

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

PLA

CET v

s D

IMA

D

PLA

CET v

s D

IMA

D (A

rnau

d f

era

ri)

(Arn

au

d f

era

ri)

Horizontal phase spaceVertical phase space

o

f entr

ies

o

f entr

ies

o

f entr

ies

o

f entr

ies

HorizontalHorizontalVerticalVertical

HorizontalHorizontal

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Summary Summary Halo estimates and simulationsHalo estimates and simulationsSummary Summary Halo estimates and simulationsHalo estimates and simulations

by H Burkhardt L Neukermans1 A Latina I Ahmed CERN

Done 2007 bull htgen software package with installation instructions interfaces to tracking codes and examples made availablebull htgen provides simulation and estimates of main halo production processes applied to ILC amp CLIC

Process availablebull Beam-gas elastic scattering (mott)bull Beam-gas in-elastic scattering (Bremsstrahlung)

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

SummarySummarySummarySummary

Ongoing and future work Ongoing and future work

bull Online manual for the htgen software packageOnline manual for the htgen software packagebull Improve the HTGEN package Improve the HTGEN package bull Simplify HTGEN commands and provide control and Simplify HTGEN commands and provide control and

diagnostics output implement further halo production diagnostics output implement further halo production mechanismsmechanisms

bull Reduce dependence on external libs (CLHEP GS in Reduce dependence on external libs (CLHEP GS in case of placet) cleaner interfaces -- less globals and case of placet) cleaner interfaces -- less globals and copying of structurescopying of structures

bull Update to recent synchrotron radiation code work with Update to recent synchrotron radiation code work with HTGEN users provide help and follow up on requests HTGEN users provide help and follow up on requests tests and benchmarking measurements (ATF CTF3) tests and benchmarking measurements (ATF CTF3) and with other codes -- Geant4 BDSIMand with other codes -- Geant4 BDSIM

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Objectives and upcomingObjectives and upcomingObjectives and upcomingObjectives and upcoming

Halo estimation in Drive beam system Halo estimation in Drive beam system (struggling but PETS--)(struggling but PETS--)

Halo estimation in Beam Delivery System Halo estimation in Beam Delivery System (Done)(Done)

Halo estimation in Post-collision line Halo estimation in Post-collision line (Done even not so important)(Done even not so important)

Halo estimation in Main LINACHalo estimation in Main LINAC(Done)(Done)

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

Back-up SlidesBack-up SlidesBack-up SlidesBack-up Slides

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27

• Slide 1
• Beam Delivery System
• CLIC BDS Optics
• Halo and tail sources
• Beam-halo collimation
• Beam Halotail and Background at IP
• Beam-gas scattering phenomena
• Beam profile at the entrance
• Beam profile in the final quadrupole
• Halo Phase space plots in final quadrupole
• Placet-htgen simulation
• Slide 12
• Slide 13
• Beam-Halo (scattering angle dependence)
• Halo- energy dependence
• Slide 16
• Slide 17
• Halo Distributions in LINAC
• Halo spectrum in LINAC
• Slide 20
• Halo in Post collision line
• Slide 22
• Summary Halo estimates and simulations
• Summary
• Objectives and upcoming
• Back-up Slides
• Slide 27