Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 70: Instrumentation XX

HK 70.3: Talk

Friday, March 18, 2016, 14:45–15:00, S1/01 A3

Spatial Resolution of a GEM-TPC Detector* — •Martin Berger — TU München, 85748 Garching, Germany

With the use of GEM foils instead of conventional MWPCs for the electrons amplification in a TPC one can overcome the rate limitations introduced by the gating grid by exploiting the intrinsic ion backflow suppression of the GEM foils. In order to validate the feasibility of such a GEM-TPC, a prototype detector with a drift length of 728 mm and a radius of 308 mm and a total of 10254 electronic channels, was built as an upgrade for the FOPI experiment at GSI (Darmstadt, Germany) to improve the acceptance, PID capabilities and vertex resolution of FOPI. After commissioning, a large statistics of cosmic muon tracks and beam-target reactions have been collected and the obtained tracks in the TPC have been used to improve the tracking algorithms. During the track finding and fitting procedure a clustering algorithm which takes into account the track topology as well as the full 3D spatial information is employed. The clustering algorithm, the cluster error calculation as well as correction algorithms and the tracking resolution will be discussed in this contribution.

*Supported by BMBF, TUM Graduate School and Excellence Cluster "Universe".