Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 22: Instrumentation 8

HK 22.2: Talk

Tuesday, March 24, 2015, 14:45–15:00, M/HS2

Spatial Resolution Studies of a GEM-TPC.* — •Martin Berger for the GEM-TPC collaboration — TU München, 85748 Garching, Germany

A GEM-TPC can exploit the intrinsic suppression of back drifting ions from the amplification stage of the GEM (Gas Electron Multiplier) foils to overcome the problem of drift-field distortions in an ungated operation. To explore the possibility of such a continuously running TPC (Time Projection Chamber) a large-size detector was built. This detector, with a drift length of 728 mm and a radius of 308 mm and a total of 10254 electronic channels, was designed as an upgrade for the FOPI experiment at GSI (Darmstadt, Germany) to improve the secondary vertex resolution especially for K_S⁰- and Λ-reconstruction and the PID capabilities. After commissioning a large statistics of cosmic data and beam-target reactions has been collected [1] 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 the clustering algorithm, the cluster error calculation and the tracking resolution will be discussed in this contribution.
1L. Fabbietti et al., Nucl. Instr. and Meth. A, 628 204-208 (2011)
*Supported by BMBF, TUM Graduate School and Excellence Cluster “Universe”.