Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

Possibility of bright, polarized high Possibility of bright, polarized high energy photon sources at the energy photon sources at the

Advanced Photon SourceAdvanced Photon Source

Yuelin LiAdvanced Photon Source, Argonne National Laboratory

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

OutlineOutline

1. Introduction: Existing -ray facilitiesAPS overviewWhy APS -ray?

2. Compton scattering basics3. Possible performance of the APS -ray facility

BoosterStorage ring

4. Laser systems5. Summary

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

OutlineOutline

1. Introduction: Existing -ray facilitiesAPS overviewWhy APS -ray?

2. Compton scattering basics3. Possible performance of APS -ray facility

BoosterStorage ring

4. Laser systems5. Summary

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

Existing Existing -ray facilities-ray facilities

LEPS5106/s @ 2.4 GeV

Why

2106/s @ 1.5 GeV

HIGS108/s @ 0.2 GeV

LEGS5106/s @ 0.5 GeV

GRAAL3106/s @ 1.5 GeV

ROKK3106/s @ 1.6 GeV

Only sun shine.

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

APS overview 1APS overview 1

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

APS overview 2APS overview 2

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

APS overview 3APS overview 3

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

Booster Stores .4-4 GeV beamBooster Stores .4-4 GeV beam

APS booster storage ring

20 m

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

APS SRAPS SR

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

OutlineOutline

1. Introduction: Existing -ray facilitiesAPS overviewWhy APS -ray?

2. Compton scattering basics3. Possible performance of APS -ray facility

BoosterStorage ring

4. Laser systems5. Summary

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

APS parametersAPS parameters

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

APS: Top-up operationAPS: Top-up operation

2-3 nC/2 min 108 e-/s

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

OutlineOutline

1. Introduction: Existing -ray facilitiesAPS overviewWhy APS -ray?

2. Compton scattering basics3. Possible performance of APS -ray facility

BoosterStorage ring

4. Laser systems5. Summary

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

Compton scattering basics Compton scattering basics

22

2

)(4

1

4

mc

EE

EL

Ls

mc2, mv

mc2, mv

Esh

ELh

)1(2

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1)1ln(

841

222

2

xxx

xxx

re

22

4)cos1(2

mc

E

mc

Ex LL

a

aPP Laser 2max )1(

2

2

a=1/(1+x)

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

Photon flux calculationPhoton flux calculation

2

2

2

2

2

2

2/3 2

)(

22exp

)2( zyxzyx

ee

ctzyxNf

2

2

20

22

20

2/3 2

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RZ

w0=20

w02

2

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Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

Photon flux and bunch lifetimePhoton flux and bunch lifetime

220

2202 yx

pe NNN

.2ln

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rfNrNrrNF ef

e

f

j

je

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Flux

Lifetime

Photons perscattering

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

Booster: Intrabeam scatteringBooster: Intrabeam scattering

1 2 3 40

2

4

6

8

10

1 2 3 40.00

0.05

0.10

0.15

1 2 3 4

0

50

100

(a)

z (m

m)

Beam energy (GeV)

(b)

e (%

)

Beam energy (GeV)

(c) 2.5 nC 10. nC 0

x (n

m r

ad)

Beam energy (GeV)

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

OutlineOutline

1. Introduction: Existing -ray facilitiesAPS overviewWhy APS -ray?

2. Compton scattering basics3. Possible performance of APS -ray facility

BoosterStorage ring

4. Laser systems5. Summary

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

Performance: energy, Performance: energy, polarizationpolarization

101 102 1030.85

0.90

0.95

1.00

1 10

101

102

103

1 100.6

0.7

0.8

0.9

1.0

(c)

Max

imu

m P

ola

riza

tio

n

Photon energy (MeV)

(a)

1.55 eV 3.10 eV 6.20 eV

Ph

oto

n e

ner

gy

(MeV

)

Beam energy (GeV)

(b)

/ T

Beam Energy (GeV)

Booster limit, 1 GeV

SR limit, 2.8 GeV

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

Flux and life time: BoosterFlux and life time: Booster

101 102 103

106

107

108

101 102 103102

103

104

(a)

1.55 eV 2.5 W 3.1 eV 1.3 W 6.2 eV 0.4 W

P

ho

ton

flu

x (p

h/s

)

Photon energy (MeV)

(b)

Bu

nch

hal

f lif

e ti

me

(s)

Photon energy (MeV)

Coherent Reg A9000, 2.5 W, 250 kHz @ 800 nm 5 nC charge

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

Reality and Future: boosterReality and Future: boosterCurrently working charge: 2-3 nCHighest ever achieved: 4-5 nCOff-the-shelf laser: 2.5 WImmediately available: 1108 @ 0.1 GeV

2106 @ 1 GeVRepetition rate: 200 photons in 0.1 ns at 815 kHz

To get to higher fluxes* Need to up grade rf tuner to compensate large beam loading at higher charge* Replace the magnets for better beam quality* More powerful laser/intracavity scattering, 10 times or more

Foreseeable: 1109 @ 0.1 GeV2107 @ 1 GeV

Repetition rate: 2000 photons in 0.1 ns at 815 kHz

Machine Limit: 1011

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

Flux and lifetime: SRFlux and lifetime: SR

1.0 1.5 2.0 2.5 3.0108

109

1.0 1.5 2.0 2.5 3.0

102

(a)

P

ho

ton

flu

x (p

h/s

)

Photon energy (GeV)

(b)

Bu

nch

hal

f lif

e ti

me

(s)

Photon energy (GeV)

Spectra Physics Tsunami, 3.5 W, 80 MHz @ 800 nm

Injection limit

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

Reality and Future: SRReality and Future: SRCurrently injection charge: 2-3 nC/2 min

1-1.5×108 e-/s lossHighest ever achieved: 4-5 nC

1-1.5×108 e-/s for depletionOff the shelf laser: 3.5 WImmediately available: 1-2×108 @ 1, 1.7 GeV

108 @ 2.8 GeVRepetition rate: 30 photons in 0.1 ns at 6.528 MHz

To get to higher fluxes* Booster upgrade for higher charge per shot* Implement new lattice for quiet injection for more frequent injection up to 2 Hz * More powerful laser/intracavity scattering: 10 times more

Foreseeable: 1-2×109 @ 1, 1.7 GeV109 @ 2.8 GeV

Repetition rate: 300 photons in 0.1 ns at 6.528 MHz

Machine limit: 1011/s

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

Transverse injection: orbit Transverse injection: orbit disturbancedisturbance

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

Longitudinal injectionLongitudinal injection

10 ms 5 ms

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

Performance summaryPerformance summary

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

OutlineOutline

1. Introduction: Existing -ray facilitiesAPS overviewWhy APS -ray?

2. Compton scattering basics3. Possible performance of APS -ray facility

BoosterStorage ring

4. Laser systems5. Summary

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

Commercial and custom lasersCommercial and custom lasers

Example of custom laser with higher power:

4 W, 75 MHz at 527, 8 W @ 1053 nm, operating, J Lab30 W, 75 MHz at 532, 60 W @ 1064 nm, under development, J Lab

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

Laser: external buffer cavityLaser: external buffer cavity

Seed: high rep, low energy pulsesf, Es Cavity with length matching

the rep rate of the seed, L=1/f

Low rep outputEout=nEs=Es/loss

Jones and Ye, Opt Lett 27, 1848 (2002)

Purpose: Laser repetition rate adjustmentIntracavity scattering?

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

OutlineOutline

1. Introduction: Existing -ray facilitiesAPS overviewWhy APS -ray?

2. Compton scattering basics3. Possible performance of APS -ray facility

BoosterStorage ring

4. Laser systems5. Summary

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

New New -ray flux distribution map-ray flux distribution map

LEPS5106/s @ 2.4 GeV

108/s @ 2.8 GeV

2106/s @ 1.5 GeV

HIGS108/s @ 0.2 GeV

LEGS5106/s @ 0.5 GeV

GRAAL3106/s @ 1.5 GeV

More sunshine!

ROKK3106/s @ 1.6 GeV

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

ChallengesChallenges

$Funding

Laser: 0.5 MBeam line: 0.5 MMisc: 1 MDetector ?Tagger ?

Management commitment

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

AnnouncementAnnouncement

Discussion

What: Technical feasibilityPhysics possibilities

When: 8:00 PM on Monday (today)

Where: Ballroom in the Waikiki Terrace Hotel

Who: Anyone interested

Also: Dessert and coffee.

Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

AcknowledgementAcknowledgement

Advanced Photon SourceS. V. Milton, L. Emery, N. Sereno, V. Sajaev, Y. Chae, J. Lewellen,

Kathy Harkay, and Z Hunag

George Washington University B. Berman and J. Feldman

J LabG. Neil

Duke UniversityV. Litvinenko

Supported the U. S. Department of Energy, Office of Basic Energy Sciences, under Contract No. W-31-109-ENG-38.