Progress report on the A4 Compton backscattering polarimeter
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The A4 collaboration at the Dept. of Nuclear Physics, University of Mainz, is conducting experiments on parity violation in the elastic electron-nucleon-scattering which require the use of polarized beams. In order to measure the absolute beam polarization, we have installed a Compton backscattering polarimeter in front of the target, using for the first time the internal cavity concept. A maximum intra-cavity intensity of 90 W has been measured, and in August 2003, first backscattered photons have been detected. This article describes the new design concept and the current status and results.
PACS: 29.27.Hj Polarized beams – 41.85.Qg Beam analyzers, beam monitors and Faraday cups – 42.60.By Design of specific laser systems – 42.60.Da Resonators, cavities, amplifiers, arrays and rings