Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 12: Poster Session: Instrumentation and Applications

HK 12.29: Poster

Dienstag, 9. März 2004, 13:30–15:30, Foyer

The luminosity monitor of the parity violating experiment at MAMI — •Thorsten Hammel — Institut für Kernphysik, Johannes-Gutenberg-Universität Mainz, 55099 Mainz

A detector system is described which measures the luminosity of the parity violating experiment (PVA4) at MAMI to control the stability of the liquid hydrogen target. This is required for a precise study of the parity violating in the scattering of longitudinal polarized electrons on unpolarized protons. A helicity correlated fluctuation of the target density will lead to false asymmetries. The knowledge of these false asymmetries is an important requirement of the experiment. A monitor and a electronic system has been developed for the PVA4-Experiment. The Properties of the luminosity monitors, investigated in ≈2000 hours of electron beam, and its performance in the experiment are presented.