Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 52: Poster - Instrumentation I

HK 52.23: Poster

Wednesday, March 6, 2013, 16:45–19:00, HSZ 2.OG

Development of a time projection chamber for Crystal Ball at MAMI — •Oliver Steffen, 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 are developing a small Time Projection Chamber with triple GEM readout meeting the stringent space requirements of the Crystal Ball experiment. This new tracking detector will feature higher rate capabilities and allows better track reconstruction. A small GEM-TPC prototype has successfully been tested in the MAMI electron beam, showing good first results on rate capability and track reconstruction. Additional simulation studies on track resolution, detector geometry and acceptance are done to optimize the design.

This poster will give an overview of the current status of the project and present the latest results.