Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 22: Postersitzung

HK 22.90: Poster

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

The internal cavity Compton polarimeter of the A4 experiment — •Yoshio Imai — Institut für Kernphysik, Universität Mainz, D-55128 Mainz, Germany

The A4 experiment at the MAMI facility in Mainz is investigating single-spin asymmetries in the electron-nucleon-scattering with polarized beams. In order to control the beam polarization, a Compton backscattering polarimeter has been installed into the beamline. This polarimeter implements for the first time the internal cavity-concept. In July 2004, first Compton asymmetries have been measured. This contribution will present the principle of operation and the results achieved so far, and discuss the next steps towards quantitative results on the beam polarization.