A High Precision Fabry-Perot Cavity Polarimeter at HERA

Details A High Precision Fabry-Perot Cavity Polarimeter at HERA A High Precision Fabry-Perot Cavity Polarimeter at HERA

2010-05-16

arxiv.org/abs/1005.2741v2

JINST 5 P06005 (2010)

Physics

Instrumentation and Detectors

28 pages, 16 figures

Scientific paper

10.1088/1748-0221/5/06/P06005

A Fabry-Perot cavity polarimeter, installed in 2003 at HERA for the second phase of its operation, is described. The cavity polarimeter was designed to measure the longitudinal polarisation of the HERA electron beam with high precision for each electron bunch spaced with a time interval of 96ns. Within the cavity the laser intensity was routinely enhanced up to a few kW from its original value of 0.7W in a stable and controllable way. By interacting such a high intensity laser beam with the HERA electron beam it is possible to measure its polarisation with a relative statistical precision of 2% per bunch per minute. Detailed systematic studies have also been performed resulting in a systematic uncertainty of 1%.

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