A High Precision Fabry-Perot Cavity Polarimeter at HERA
Instrumentation and Detectors
2015-03-17 v2 High Energy Physics - Experiment
Abstract
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%.
Cite
@article{arxiv.1005.2741,
title = {A High Precision Fabry-Perot Cavity Polarimeter at HERA},
author = {S. Baudrand and M. Bouchel and V. Brisson and R. Chiche and M. Jacquet and S. Kurbasov and G. Li and C. Pascaud and A. Reboux and V. Soskov and Z. Zhang and F. Zomer and M. Beckingham and T. Behnke and N. Coppola and N. Meyners and D. Pitzl and S. Schmitt and M. Authier and P. Deck-Betinelli and Y. Queinec and L. Pinard},
journal= {arXiv preprint arXiv:1005.2741},
year = {2015}
}
Comments
28 pages, 16 figures