Karlsruhe 2011 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 73: Detektorsysteme III
T 73.3: Gruppenbericht
Freitag, 1. April 2011, 14:40–15:00, 30.36: 011
Towards 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.
As a prototype of a PANDA TPC a large-volume detector with a ring-cylindrical shape of the drift volume with diameters of 10/30 cm and 73 cm length has been set up. A triple-GEM stack serves as an amplification stage. The signals of 10254 hexagonal pads are read out using front end cards based on the AFTER-T2K chip.
Two copies of this system will be installed and employed in 2011 within both the FOPI spectrometer at GSI and the Crystal-Barrel experiment at ELSA in Bonn.
In this contribution, we will present the status of the project; report on the design and construction of the detector system as well as results obtained during the commissioning and first beam experiments.