Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 39: Instrumentation and Applications V

HK 39.8: Talk

Thursday, March 11, 2004, 15:45–16:00, C

Stabilization of the laser system of the A4-Compton-Backscattering-Polari meter — •Jürgen Diefenbach — Institut für Kernphysik, Universität Mainz

The A4 collaboration measures strange form factors of the nucleon in the elastic scattering of polarized electrons off the proton at the MAMI accelerator facility in Mainz. To perform an online monitoring of the electron beam polarization a laser backscattering compton polarimeter has been developped. Due to the new intracavity design of the backscattering polarimeter an active stabilization of the 8.2m 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 actual setup of the stabilization will be presented and discussed.