Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 22: Postersitzung

HK 22.88: Poster

Monday, March 7, 2005, 16:30–18:00, TU MA141

The active stabilization of the laser system of the A4-Compton-Backscattering-Polarimeter — •Jürgen Diefenbach — Institut für Kernphysik, Universität Mainz

The A4 collaboration measures single-spin asymmetries (e.g. parity violation) in the elastic scattering of polarized electrons off the nucleon at the MAMI accelerator facility in Mainz. To perform an online monitoring of the electron beam polarization a new type of laser backscattering compton polarimeter are used. Due to the intracavity design of the backscattering polarimeter an active stabilization of the 7.8m long laser resonator is unavoidable to achieve stable overlap of laser and electron beam and to optimize the polarimeter’s luminosity. The design ideas and first results from the operation of the stabilization will be presented.