First electron beam polarization measurements with a Compton polarimeter at Jefferson Laboratory

M. Baylac , E. Burtin , C. Cavata , S. Escoffier , B. Frois , D. Lhuillier , F. Marie , J. Martino

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D. Neyret T. Pussieux (CEA Saclay DSM/DAPNIA/SPhN) P.Y. Bertin (Universite Blaise Pascal et CNRS-IN2P3) C.W. de Jager J. Mitchell (Jefferson Lab)

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classification ✦ hep-ex

keywords comptonelectronbeamfirstjeffersonlaboratorymeasurementspolarimeter

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A Compton polarimeter has been installed in Hall A at Jefferson Laboratory. This letter reports on the first electron beam polarization measurements performed during the HAPPEX experiment at an electron energy of 3.3 GeV and an average current of 40 $\mu$A. The heart of this device is a Fabry-Perot cavity which increased the luminosity for Compton scattering in the interaction region so much that a 1.4% statistical accuracy could be obtained within one hour, with a 3.3% total error.

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First electron beam polarization measurements with a Compton polarimeter at Jefferson Laboratory

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