Photon Beam Design Requirements

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Revision as of 14:58, 29 January 2008 by Jonesrt (Talk | contribs) (Global Specifications for the Hall D Photon Beam)

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Global Specifications for the Hall D Photon Beam

  1. choice of photon energy in the range 8 - 12 GeV [1]
  2. orientable diamond crystal bremsstrahlung radiator [2]
  3. peak linear polarization of 40% at 9 GeV with collimation [2,3]
  4. average polarization 36% in coherent peak 8.4 - 9.0 GeV [2,3]
  5. bremsstrahlung collimator with active stabilization [3]
  6. photons tagged in coherent peak with energy resolution better than 60 MeV (0.5%) [1,4,5]
  7. beam tagged at 1% resolution over extended range 3 - 11.4 GeV [4,6]
  8. absolute photon energy calibration better than ± 30 MeV
  9. nominal operation at 10 MHz tagged photons in coherent peak after collimator [1,3]
  10. tagging rate 25 MHz within coherent peak at nominal intensity [5]
  11. tagging possible up to 100 MHz tagged photons on target in coherent peak [1,3,5]
  12. 500 MHz beam pulse repetition rate [1,5,6]