Accurate measurement of the electron beam polarization in JLab Hall A using Compton polarimetry

Details Accurate measurement of the electron beam polarization in JLab Hall A using Compton polarimetry Accurate measurement of the electron beam polarization in JLab Hall A using Compton polarimetry

2005-04-27

arxiv.org/abs/physics/0504195v1

Nucl.Instrum.Meth.A551:563-574,2005

Physics

Instrumentation and Detectors

21 pages, 10 figures, 4 tables, submitted to Nucl. Instr. Meth. A

Scientific paper

10.1016/j.nima.2005.05.067

A major advance in accurate electron beam polarization measurement has been achieved at Jlab Hall A with a Compton polarimeter based on a Fabry-Perot cavity photon beam amplifier. At an electron energy of 4.6 GeV and a beam current of 40 uA, a total relative uncertainty of 1.5% is typically achieved within 40 min of data taking. Under the same conditions monitoring of the polarization is accurate at a level of 1%. These unprecedented results make Compton polarimetry an essential tool for modern parity-violation experiments, which require very accurate electron beam polarization measurements.

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