DOIAbstract
The polarization of the 27.5 GeV electron/positron beam of the HERA epep collider ring is routinely measured with two independent Compton polarimeters. The transverse Compton polarimeter was developed as a tool for the HERA operators to tune the machine for high beam polarization. Currently it is also used to provide reliable beam polarization measurements for the HERMES experiment which investigates the spin structure of the nucleon. An additional Compton polarimeter, which was commissioned over the last twelve months, provides an independent measurement of the longitudinal beam polarization between the spin rotators at the HERMES experiment. The operation of the two polarimeters is presented and compared to each other. © 1998 American Ins...
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