m.apolloniomice funding agency committee meeting - ral 18/4/2008 1 m. apollonio – mice operations...

m.apollonio MICE Funding Agency Committee Meeting - RAL 18/4/2008

1

M. Apollonio – MICE Operations

ManagerUniversity of

Oxford

MICE beam line commissioning


2

goals and design:∙ muon beam features∙ target∙ optics∙ diffuser

status of beam line remarks on target operation first MICE shifts [14-15/3, 29/3, 2/4, 4/4]

conclusions

layout


3

desired features

• P = [140 MeV/c, 240 MeV/c], p = +/- 10%

• easily tunable

• matched emittance: 1 mm rad < N < 10 mm rad deliverable to MICE• high purity muon beam• high rate “600 muons” per target actuation [1 Hz, 1 ms window]• acceptable losses for ISIS

Beam Features Beamline Target Optics Diffuser Beamline Status Conclusions


4

– decay beam line adopted… inspired by previous projects• PSI uE4• TRIUMF beam lines • RAL-RIKEN beam line

MICE beam line constituted by four parts1. production/capture2. decay/ capture3. transport4. N generation / matching



5


1

3

4

2

production/capture

decay

transport

match to MICE


6

upstream beamline (in the synchrotron vault)

a) target Station: p on titanium blade + p high P high P small exit angle ~25o

b) 1st Quadrupole Triplet Q1-Q2-Q3 first focussing: maximise acceptance before the decay

solenoid

c) 1st Dipole D1 first momentum selection: 60o bending B1 [select ] B2 [select ]

1 production/capture

Muon Beam Features Beamline Target Optics Diffuser State of Beamline Conclusion


7


2 decay channel

Maximise number of muons indecay section:highest decay solenoid field 5 Tconsistent with controllable beam profile.

@ 25o


8

3 transport

4

highest momenta allow selection of 'backward' going for higher purity & higher fluxes.



9

4 match to MICE


Q4-Q9 define the optics prior to the diffuser

diffuser used to inflate initial emittance in a controlled fashion

variety of final configurations and several momenta

Five thicknesses of Pb Changeable via remote control


10

Stepper motor

Actuator

Bellows

New beam-pipe

Target Station

Top Bearing

Bottom Bearing

Magnets

Coils

Water Cooling

Simplified Diagram of the

Internal Mechanics


Sheffield University


11


10 ms

20 ms

target working principle

1 ms

• titanium blade dipping at 1 Hz in the ISIS proton beam• should intercept just ~1ms of ISIS accelerated beam• withdrawal must be quick to avoid scraping next filling extreme accelerations (80g)• beam loss must comply with ISIS requirements


12


target issues

MICE target must operate with no harm for ISIS parasitic mode

• mechanical stress generated metal dust in the first target tests

• this required an improved design

• two new target stations are in preparation:• T2a will be installed in the ISIS vault• T2b will serve as a demonstrator to check T2a reliability (3x actuations)• both should be ready in ~ 1 month

• MICE is presently allowed to produce beam losses < 50 mV on ISIS BLMs

• special care has been taken to cope with this limit


13


Q1'

Q2'

Q3'Q1 Q2 Q3 B1 Solenoid

Vertical Half-width

(cm)

HorizontalHalf-width

(cm)

25

0

25

16mz

Q1'

Q2'

Q3'

Q1'

Q2'

Q3'

Q1'

Q2'

Q3'Q1 Q2 Q3 B1 Solenoid

Vertical Half-width

(cm)

HorizontalHalf-width

(cm)

25

0

25

16mz

[K. Tilley, MICE Beamline Review, IC 2007]

optics

optics


14


determine thicknesses (T)

13

=1.4 mm rad

x

x’


15


[MA, MICE Beamline Review, IC 2007]

Diffuser Plates Thicknesses in (,P) space


16


Oxford University


17

IC2: >29/3

IC1: 29/3

BM1: >29/3

GVA1: > 4/4 GVA2: > 29/3

BM2:>29/3


MICE beamline detector locations


18

MICE has been given 5 shift times so far: 14-15/3, 29/3, 2-4/4

Summary of 14-15/3 shift operations:

- power failure on D1 supply no beam line focus on target - Q1-3 inoperative

- target successfully run in synchronization with the beam

- depth and delay of target dip investigated to limit by any beam loss monitor reading <50 mV

- limit reasonably stable and not oversensitive to dip depth

- ran target at a good stable setting and a frequency of 50/128Hz (ISIS at 50Hz)

- verified target hitting properly end of one ISIS fill without scraping following one

- operation mode: MICE in parasitic mode.

- radiation survey soon after shift (3679 target pulses) showed no significant increase in radiation

- cabling for Beam Monitors and future detectors done

- the successful operation of the target shows we can use it for our purposes with no harm for ISIS (parasitic mode): fundamental for future operations



19


Target Dip Depth and Delay


20

target depth vs time

ISIS filling

integrated BLM fromISIS MCR

MICE target dipping into ISIS beam

P.

Hodgso

n

no difference in beam loss at injection W or W/O target



21

Summary of 29/3 shift operations:

- D1, D2, Q4-5-6 powered and tested- Q6 showed water leak ! cut triplet out: only D1 and D2 to test proton selection- Beam Monitors (Fermilab) and Beam Counters (IC + Geneva) installed - D1 and D2 powered up: D1 set at 400 A, D2 scanned to find the maximum rate [4 ms gate]- use of remote control system to operate dipoles- first counts on beam monitors- first evidence of selected protons at the end of DSA- total actuations: ~ 6000

-operations with dipoles and definition of particle transport from target to end of DSA (in agreement with calculations for selected momentum ~ 480 MeV/c)



22

GVA2 counts

0

50

100

150

200

250

300

350

400

450

0 50 100 150 200

D2 current (A) with D1=400A

Co

un

ts

TARGET control

Dipoles control

Beam Monitor and IC counter displays


23

Summary of 2-4/4 shifts operations:

- GVA1 counter installed (with proper mu-metal shield)- Cherenkov counters ON- establish target depth and delay- re-establish dipole configuration (400A,170A) = 480 MeV/c- first pions in the Cherenkov counterA- start radiation survey- stopped! due to ISIS beam failure

- re-establish previous conditions - survey: completed!- D2 scan [2 ms gate]: verify reproducibility- MICE detectors DAQ turned ON

- radiation survey completed (main goal of these shifts) no radiation detected [next page]- clear control of the dipole line- first pions seen in the Cherenkov- DAQ exercised- very preliminary estimates of POT (G4Beamline): order of 1010 per dip (2 ms) [need to check vs counter efficiency]- NB: 600 good muons require 1012 POT

2/4: ~2000 actuations

4/4: ~6000 actuations



24


“Herewith radiation survey carried out on Friday 4 April with target dipping. Nothing obvious. But should re-measure with machine at 50 pps rather than at 50/32 pps, and also if increase extent of target dip.”

MICE HALL RADIATION SURVEY.DATE: 04/04/2008 TIME: 20.30 HRSBEAM STATUS: 1.6 Hz 5µa.MICE TGT: IN.MONITORS: NEUTRON MONITOR 5, RO-10 C726, TELETECTOR 612.

ZONE µSV/HR n µSV/HR γ

1 <1 <1

2 <1 <1

3 <1 <1

4 <1 <1

5 <1 <1

6 <1 <1

7 <1 <1

8 <1 <1

9 <1 <1

10 <1 <1

SURVEYOR: J.KENT

from D. Findlay’s mail on MICE Radiation Survey


25

GVA2 beam monitor

CKOV 1a PMT1

CKOV 1a PMT2

CKOV 1a PMT3


seen in the Cherenkov Detector April 2nd 2008


26

D2 Current (Amps) V GVA2/GVA1

-50

0

50

100

150

200

250

300

350

-50 0 50 100 150 200 250

D2 Current

Cou

nts

in G

VA2



27

D1

D2

Q4

Q1

Q2

Q3

DS

Q5 Q6 Q7 Q8 Q9

cold test start: 21/4, electrical test to follow

MICE magnet status17/4/2008

superconducting solenoid


Q9

Q8

Q7

Q6

Q5

Q4

D2

D1

Q3

Q2

Q1

commissionedRemote control

Soak testPolarity check

PS current

Magnet cooling

PS

cooling

Magnet

completeted

not completed

to be done


28


MICE Hall on 20/2/2008


29


MICE beamline upstream section


30


Mississippi Team at work [Cherenkov]Fermilab Team [Beam Monitors]

… mice at work


31


IC beam counter and Decay Solenoid entrance

Installing Beam Monitors in the DSA


32


summary∙ a tremendous amount of work in the last few months∙ all beam line magnets in place

∙ 3 quadrupole-triplets, 2 dipoles, decay solenoid∙ first transported protons on March 29th ∙ initial complement of beam line detectors in place

… still a lot to be done

next steps∙ complete magnet commissioning ∙ commission T2a & T2b ∙ TOF0,1 installation∙ diffuser commissioning ∙ remotely operable beam stop, collimators, correctors


33


Acknowledgementsmany thanks to:

RAL people (PPD, Cryogenics, Design, ISIS), MERIT contractors, Electrical contractors, Daresbury Lab, MICE collaborators …

… and all who made this possible

m.apolloniomice funding agency committee meeting - ral 18/4/2008 1 m. apollonio – mice operations...

Documents

diffuser diffuser

beam linemice beam line

upstream beamline

beam withdrawal

decay beam line

beam lines ralriken

isis proton beam

target actuation