Mainz 2012 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 11: Instrumentation

HK 11.4: Vortrag

Montag, 19. März 2012, 17:30–17:45, P 2

Fast Simulation Studies for a Crystal Ball TPC — •Martin Wolfes, Oliver Steffen, Wolfgang Gradl, and Martin Hattemer — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz

The A2-Collaboration at MAMI studies photon induced reactions with the Crystal Ball/TAPS detector, which covers almost the whole solid angle of 4π. The photon beam is produced via energy tagged bremsstrahlung. The inner detector system includes a two-layer MWPC for the detection of charged particle tracks.

The increased rate of charged particles for future η and η^′ production experiments exceeds the rate capabilities of these MWPCs. A possible solution is to replace the existing tracking detectors with a small Time Projection Chamber (TPC). This type of detector has higher rate capability and provides the means for real track reconstruction.

To study detector and track resolution we have developed a parameter-driven fast simulation, in which different chamber geometries and readout pad configurations can be implemented very easily. The simulation includes ionisation statistics, transversal and longitudinal diffusion within the electric field, gas amplification of an arbitrary number of GEM foils and signal response from the electronics. The fast simulation can also be used to test the reconstruction software. We present recent results obtained with this simulation.