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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
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a
aPP Laser 2max )1(
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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
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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
)1ln(
2ln1
,)1(1)1(1
0
frrfT
rfNrNrrNF ef
e
f
j
je
eN
Nr
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.