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HK: Fachverband Physik der Hadronen und Kerne

HK 53: Poster – Instrumentation

HK 53.27: Poster

Donnerstag, 22. März 2012, 14:00–16:00, P Foyer

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

The Crystal Ball Collaboration uses energy tagged bremstrahlung photons produced from the MAMI electron beam to study photo-induced reactions on nucleons and nuclei. The Crystal Ball/TAPS 4π calorimeter setup is optimized for the detection of neutral final states. Charged particles are identified and measured by the inner detector system including a two layer MWPC. The increased rate of charged particles in current and future experiments exceeds the rate capability of these MWPCs. We study the possibility to construct a small Time Projection Chamber with triple GEM readout as a replacement. Besides higher rate capabilities, such a detector allows real track reconstruction with better angular resolution and may contribute to particle identification. A small TPC prototype with triple-GEM readout is used together with simulation studies to investigate track resolution and detector geometry in order to build a new compact tracking device meeting the stringent space requirements for a tracking detector for the Crystal Ball experiment. This poster will give an overview of the current status of the project.