Difference between revisions of "Photon Beam Design Requirements"

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(Global Specifications for the Hall D Photon Beam)
(Global Specifications for the Hall D Photon Beam)
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# choice of photon energy in the range 8 - 12 GeV [1]
 
# choice of photon energy in the range 8 - 12 GeV [1]
 +
# 500 MHz beam pulse repetition rate [1]
 
# orientable diamond crystal bremsstrahlung radiator [2]
 
# orientable diamond crystal bremsstrahlung radiator [2]
 
# peak linear polarization of 40% at 9 GeV with collimation [2,3]
 
# peak linear polarization of 40% at 9 GeV with collimation [2,3]
 
# average polarization 36% in coherent peak 8.4 - 9.0 GeV [2,3]
 
# average polarization 36% in coherent peak 8.4 - 9.0 GeV [2,3]
# bremsstrahlung collimator with active stabilization [3]
+
# photon beam collimator with half-angle 22 μr [3]
# photons tagged in coherent peak with energy resolution better than 60 MeV (0.5%) [1,4,5]
+
# photon beam centered on collimator to within ± 3 μr [3]
# beam tagged at 1% resolution over extended range 3 - 11.4 GeV [4,6]
+
# photons tagged with energy resolution better than 60 MeV (0.5%) within coherent peak [1,4,5]
 +
# beam tagged with reduced resolution over extended range 3 - 11.4 GeV [4,6]
 +
# complete tagger coverage in range 9.0 - 11.4 GeV at 1% resolution [6]
 
# absolute photon energy calibration better than ± 30 MeV
 
# absolute photon energy calibration better than ± 30 MeV
 
# nominal operation at 10 MHz tagged photons in coherent peak after collimator [1,3]
 
# nominal operation at 10 MHz tagged photons in coherent peak after collimator [1,3]
 
# tagging rate 25 MHz within coherent peak at nominal intensity [5]
 
# tagging rate 25 MHz within coherent peak at nominal intensity [5]
 
# tagging possible up to 100 MHz tagged photons on target in coherent peak [1,3,5]
 
# tagging possible up to 100 MHz tagged photons on target in coherent peak [1,3,5]
# 500 MHz beam pulse repetition rate [1,5,6]
+
# continuous real-time monitoring of post-collimator beam spectrum [6]
 +
# average polarization within coherent peak determined with absolute accuracy ±2%.

Revision as of 16:19, 29 January 2008

Global Specifications for the Hall D Photon Beam

  1. choice of photon energy in the range 8 - 12 GeV [1]
  2. 500 MHz beam pulse repetition rate [1]
  3. orientable diamond crystal bremsstrahlung radiator [2]
  4. peak linear polarization of 40% at 9 GeV with collimation [2,3]
  5. average polarization 36% in coherent peak 8.4 - 9.0 GeV [2,3]
  6. photon beam collimator with half-angle 22 μr [3]
  7. photon beam centered on collimator to within ± 3 μr [3]
  8. photons tagged with energy resolution better than 60 MeV (0.5%) within coherent peak [1,4,5]
  9. beam tagged with reduced resolution over extended range 3 - 11.4 GeV [4,6]
  10. complete tagger coverage in range 9.0 - 11.4 GeV at 1% resolution [6]
  11. absolute photon energy calibration better than ± 30 MeV
  12. nominal operation at 10 MHz tagged photons in coherent peak after collimator [1,3]
  13. tagging rate 25 MHz within coherent peak at nominal intensity [5]
  14. tagging possible up to 100 MHz tagged photons on target in coherent peak [1,3,5]
  15. continuous real-time monitoring of post-collimator beam spectrum [6]
  16. average polarization within coherent peak determined with absolute accuracy ±2%.