2022 Impact factor 2.7
Hadrons and Nuclei
Open Access
Eur. Phys. J. A 24, s2.127-s2.128 (2005)
DOI: 10.1140/epjad/s2005-04-029-7

Progress report on the A4 Compton backscattering polarimeter

Yoshio Imai

Inst. für Kernphysik, Universität Mainz, J.-J.-Becher-Weg 45, D-55128 Mainz, Germany

(Received 01 November 2004 / Published online 08 February 2005)


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

The Author, for the A4 Collaboration. This work comprises part of the author's PhD thesis.

© Società Italiana di Fisica, Springer-Verlag 2005