Bonn 2010 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 31: Instrumentierung VI
HK 31.9: Talk
Tuesday, March 16, 2010, 18:45–19:00, HG IX
Design of GEM-based Trackers for PANDA — •Bernd Voss, Jochen Kunkel, and Radoslaw Karabowicz — GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
In the PANDA experiment at the new Facility for Antiproton and Ion Research (FAIR) at Darmstadt, Germany, particles emitted at angles below 22∘ may not be fully covered by the Central Tracker in the target spectrometer. They will be tracked with a set of up to four large-area planar gaseous micro-pattern detectors based on GEM foils as amplification stages. In order to optimize the acceptance, these GEM-Trackers have to be of large diameter of Ø0.9m, 1.12m and 1.48m and will be placed 0.81m, 1.17m, 1.53m and 1.89m downstream of the target, respectively. The current design assumes up to four double planes with two projections per plane. With the envisaged position resolution of 0.1mm the system promises sufficient momentum resolution and a double track resolution of 10mm and 5∘, respectively, in the range of forward angles of 5 to 18∘. The chambers have to sustain a high counting rate of particles peaked at the most forward angles due to the relativistic boost of the reaction products as well as due to the small angle pp elastic scattering. With the envisaged luminosity, the expected particle flux in the first chamber in the vicinity of the 6.5 cm diameter beam pipe is about 8*104 cm−2s−1. Moreover, the chambers have to work in the 2T magnetic field produced by the solenoid. In this talk, we will present the status of the project and report on the design and construction of the detector system.