Bonn 2010 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 31: Instrumentierung VI

HK 31.1: Gruppenbericht

Dienstag, 16. März 2010, 16:30–17:00, HG IX

Development of a GEM-based TPC for PANDA — •Bernd Voss — GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany

A Time Projection Chamber (TPC) is a very promising option for the central tracker of the PANDA experiment at the new Facility for Antiproton and Ion Research (FAIR) at Darmstadt, Germany.

Installed in a ring-type experiment with 2x107 pp annihilations per second it has to be operated continuously despite the presence of space charge effects. These are kept at a bearable level using GEM-based amplification providing an intrinsic suppression of ion backflow. The system promises high-accuracy tracking as well as information on the specific energy-loss and features high momentum resolution of 1% as well as particle-identification capability with a highly homogeneous and low material budget. A test TPC with an active volume of 8 cm length and a diameter of 20 cm was operated in 2009 at the test-bench of the CB-ELSA experiment in Bonn. It served to investigate some of the relevant design features, the electronic foreseen for the readout as well as the analysis procedures. A large-volume TPC with a drift length of 70 cm and an active diameter of 30 cm is being built in parallel. Due to its very similar design it serves as a precursor prototype of a PANDA TPC. This detector will be installed and employed in 2010 within both the FOPI spectrometer at GSI and the Crystal-Barrel experiment at ELSA in Bonn. In this talk, we will present the status of the project; report on the results obtained with the test detector as well as the design and construction of the GEM-TPC prototype.

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