This polarimeter detects Compton-scattered electrons from the collision of the longitudinally polarized electron beam with a circularly polarized photon beam. The photon beam is produced from a pulsed Nd:YAG laser operating at 532 nm. After the Compton Interaction Point (CIP), the electrons pass through a dipole spectrometer; a nine-channel Cherenkov detector then measures electrons in the range 17 to 30 GeV.
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