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Possibility of bright, polarized high energy photon sources at the Advanced Photon Source

Possibility of bright, polarized high energy photon sources at the Advanced Photon Source. Yuelin Li Advanced Photon Source, Argonne National Laboratory. Outline. Introduction: Existing g -ray facilities APS overview Why APS g -ray? Compton scattering basics

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Possibility of bright, polarized high energy photon sources at the Advanced Photon Source

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  1. Possibility of bright, polarized high energy photon sources at the Advanced Photon Source Yuelin Li Advanced Photon Source, Argonne National Laboratory Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

  2. Outline • Introduction: Existing g-ray facilities • APS overview • Why APS g-ray? • Compton scattering basics • Possible performance of the APS g-ray facility • Booster • Storage ring • Laser systems • Summary Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

  3. Outline • Introduction: Existing g-ray facilities • APS overview • Why APS g-ray? • Compton scattering basics • Possible performance of APS g-ray facility • Booster • Storage ring • Laser systems • Summary Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

  4. Existing g-ray facilities GRAAL 3106/s @ 1.5 GeV Why LEGS 5106/s @ 0.5 GeV ROKK 3106/s @ 1.6 GeV 2106/s @ 1.5 GeV LEPS 5106/s @ 2.4 GeV HIGS 108/s @ 0.2 GeV Only sun shine. Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

  5. APS overview 1 Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

  6. APS overview 2 Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

  7. APS overview 3 Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

  8. Booster Stores .4-4 GeV beam 20 m APS booster storage ring Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

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

  10. Outline • Introduction: Existing g-ray facilities • APS overview • Why APS g-ray? • Compton scattering basics • Possible performance of APS g-ray facility • Booster • Storage ring • Laser systems • Summary Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

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

  12. APS: 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

  13. Outline • Introduction: Existing g-ray facilities • APS overview • Why APS g-ray? • Compton scattering basics • Possible performance of APS g-ray facility • Booster • Storage ring • Laser systems • Summary Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

  14. Es,h/l gmc2, gmv q EL,h/l gmc2, gmv Compton scattering basics a=1/(1+x) Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

  15. w0 w0=2s0 Photon flux calculation Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

  16. Photon flux and bunch lifetime Photons per scattering Flux Lifetime Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

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

  18. Outline • Introduction: Existing g-ray facilities • APS overview • Why APS g-ray? • Compton scattering basics • Possible performance of APS g-ray facility • Booster • Storage ring • Laser systems • Summary Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

  19. Booster limit, 1 GeV SR limit, 2.8 GeV Performance: energy, polarization Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

  20. Flux and life time: Booster 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

  21. Reality and Future: booster Currently working charge: 2-3 nC Highest ever achieved: 4-5 nC Off-the-shelf laser: 2.5 W Immediately available: 1108 @ 0.1 GeV 2106 @ 1 GeV Repetition 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: 1109 @ 0.1 GeV 2107 @ 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

  22. Flux and lifetime: SR Injection limit Spectra Physics Tsunami, 3.5 W, 80 MHz @ 800 nm Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

  23. Reality and Future: SR Currently injection charge: 2-3 nC/2 min 1-1.5×108 e-/s loss Highest ever achieved: 4-5 nC 1-1.5×108 e-/s for depletion Off the shelf laser: 3.5 W Immediately available: 1-2×108 @ 1, 1.7 GeV 108 @ 2.8 GeV Repetition 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 GeV 109 @ 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

  24. Transverse injection: orbit disturbance Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

  25. Longitudinal injection 5 ms 10 ms Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

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

  27. Outline • Introduction: Existing g-ray facilities • APS overview • Why APS g-ray? • Compton scattering basics • Possible performance of APS g-ray facility • Booster • Storage ring • Laser systems • Summary Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

  28. Commercial and custom lasers Example of custom laser with higher power: 4 W, 75 MHz at 527,  8 W @ 1053 nm, operating, J Lab 30 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

  29. Low rep output Eout=nEs=Es/loss Seed: high rep, low energy pulses f, Es Cavity with length matching the rep rate of the seed, L=1/f Laser: external buffer cavity Purpose: Laser repetition rate adjustment Intracavity scattering? Jones and Ye, Opt Lett 27, 1848 (2002) Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

  30. Outline • Introduction: Existing g-ray facilities • APS overview • Why APS g-ray? • Compton scattering basics • Possible performance of APS g-ray facility • Booster • Storage ring • Laser systems • Summary Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

  31. New g-ray flux distribution map 108/s @ 2.8 GeV GRAAL 3106/s @ 1.5 GeV LEGS 5106/s @ 0.5 GeV ROKK 3106/s @ 1.6 GeV 2106/s @ 1.5 GeV LEPS 5106/s @ 2.4 GeV HIGS 108/s @ 0.2 GeV More sunshine! Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

  32. Challenges $ Funding Laser: 0.5 M Beam line: 0.5 M Misc: 1 M Detector ? Tagger ? Management commitment Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

  33. Announcement Discussion What: Technical feasibility Physics 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

  34. Acknowledgement Advanced Photon Source S. 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 Lab G. Neil Duke University V. Litvinenko Supported the U. S. Department of Energy, Office of Basic Energy Sciences, under Contract No. W-31-109-ENG-38. Workshop on New Aspects of Quark Nuclear Physics with Polarized Photons, Feb. 17-20, Honolulu

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