Electron polarization measurement using a Fabry-Perot cavity at HERA

Details Electron polarization measurement using a Fabry-Perot cavity at HERA Electron polarization measurement using a Fabry-Perot cavity at HERA

2002-01-21

arxiv.org/abs/hep-ex/0201033v1

Physics

High Energy Physics

High Energy Physics - Experiment

Talk given at the International Europhysics Conference on High Energy Physics, Budapest (Hungary), July 12-18, 2001. On behalf

Scientific paper

A new Compton longitudinal polarimeter currently under construction for HERA is presented. The key component of the polarimeter is a Fabry-Perot cavity located around the electron beam pipe. With such an optical cavity, a continuous laser power equivalent to 5 kW, much higher than those commercially available, can be achieved, leading to one backscattered photon per bunch crossing. This ``few-photon mode'' will allow a very precise determination of the calorimeter response with little systematic uncertainty. The electron polarization measurement at the per mill level is expected.

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