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

Abstract : 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 $\mu$A, 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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Submitted on : Friday, January 5, 2007 - 2:13:23 PM
Last modification on : Tuesday, April 20, 2021 - 12:00:07 PM

### Citation

S. Escoffier, P.Y. Bertin, M. Brossard, E. Burtin, C. Cavata, et al.. Accurate measurement of the electron beam polarization in JLab Hall A using Compton polarimetry. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Elsevier, 2005, 551, pp.563-574. ⟨10.1016/j.nima.2005.05.067⟩. ⟨in2p3-00024386⟩

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