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HK: Fachverband Physik der Hadronen und Kerne

HK 7: Instrumentierung I

HK 7.3: Vortrag

Montag, 21. März 2011, 14:30–14:45, HS1

Development of a time projection chamber for Crystal Ball at MAMI — •Oliver Steffen, Wolfgang Gradl, and Achim Denig — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz

The Crystal Ball Collaboration at the electron accelerator MAMI in Mainz studies photo-induced reactions on nucleons and nuclei with energy tagged photons produced via bremsstrahlung. The Crystal Ball/TAPS calorimeters form a 4π detector optimized for the detection of neutral final states. The inner detector system includes a two-layer MWPC for the detection of charged particle tracks.

The increased rate of charged particles in current and future experiments exceeds the rate capabilities of these MWPCs. As a replacement option, a Time Projection Chamber (TPC) with triple GEM readout is being considered. Besides higher rate capabilities, such a detector allows real track reconstruction with better angular resolution and may contribute to particle identification.

A detector test stand was set up in Mainz, and a small TPC prototype with triple-GEM readout was put into operation. This allows basic studies of detector parameters and the future development of readout electronics. In this talk, we present design considerations for such a tracking device for Crystal Ball and report on first results of tests with cosmic particles.