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T: Fachverband Teilchenphysik

T 117: Beschleunigerphysik IV (Polarisation)

T 117.7: Talk

Monday, March 4, 2013, 18:15–18:30, WIL-C203

Vector polarimetry at MAMI — •Fabian Nillius and Kurt Aulenbacher — Instituts für Kernphysik, Johannes Gutenberg-Universität Mainz

Electron/photon tensor-correlation coefficients may allow to design a polarimeter that can measure all components of beam polarisation simultaneously ("vector polarimeter"). Besides its purpose as a beam diagnostic device this would also allow to test theoretical predictions for the correlation coefficients at energies between 1 and 3.5 MeV. As a first step we have set up a measurement of the helicity transfer to the photon as a function of energy which is based on the Compton absorption method. Apparative developments in order to measure photon emission asymmetries caused by transverse and longitudinal electron polarisation are presented. This work was supported by the Deutsche Forschungsgemeinschaft through SFB 443.