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Principal Elements in Hall D Photon Beam Line Axis Definition. primary (active) collimator. beam position monitors. radiator crystal. secondary collimator. tagging spectrometer. LH 2 target. photon beam pipe. Region II. Region I. Region III. 0. -20. -10. 10. 20. 30. 40. 50. 60.
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Principal Elements in Hall D Photon Beam Line Axis Definition primary (active) collimator beam position monitors radiator crystal secondary collimator tagging spectrometer LH2 target photon beam pipe Region II Region I Region III 0 -20 -10 10 20 30 40 50 60 70 80 90 100 distance along photon beam line (m)