Physics – Instrumentation and Detectors
Scientific paper
2011-06-23
J. Phys.: Conf. Ser. 312 (2011) 052018
Physics
Instrumentation and Detectors
6 pages, 7 figures. To appear in the Proceedings of the International Nuclear Physics Conference (INPC 2010), July 4-9 2010, V
Scientific paper
10.1088/1742-6596/312/5/052018
A wide range of nucleon and nuclear structure experiments in Jefferson Lab's Hall A require precise, continuous measurements of the polarization of the electron beam. In our Compton polarimeter, electrons are scattered off photons in a Fabry-Perot cavity; by measuring an asymmetry in the integrated signal of the scattered photons detected in a GSO crystal, we can make non-invasive, continuous measurements of the beam polarization. Our goal is to achieve 1% statistical error within two hours of running. We discuss the design and commissioning of an upgrade to this apparatus, and report preliminary results for experiments conducted at beam energies from 3.5 to 5.9 GeV and photon rates from 5 to 100 kHz.
Benmokhtar F.
Franklin G.
Friend M.
Michaels Robert
Nanda Sanjay
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