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, 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)
TL;DR
This paper reports the first electron beam polarization measurements using a Compton polarimeter at Jefferson Laboratory, demonstrating high precision at 3.3 GeV energy during the HAPPEX experiment.
Contribution
It introduces a Compton polarimeter with a Fabry-Perot cavity enabling precise polarization measurements at Jefferson Laboratory.
Findings
Achieved 1.4% statistical accuracy within one hour
Total measurement error of 3.3%
Successful implementation during HAPPEX experiment
Abstract
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 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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Taxonomy
TopicsParticle Detector Development and Performance · Particle Accelerators and Free-Electron Lasers · Particle accelerators and beam dynamics