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

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arxiv physics/0504195 v1 pith:7DRDBTGN submitted 2005-04-27 physics.ins-det

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

S. Escoffier , P.Y. Bertin , M. Brossard , E. Burtin , C. Cavata , N. Colombel , C.W. de Jager , A. Delbart
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D. Lhuillier F. Marie J. Mitchell D. Neyret T. Pussieux
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keywords beamaccurateelectronpolarizationcomptonachievedhalljlab
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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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