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HK: Fachverband Physik der Hadronen und Kerne

HK 39: Instrumentierung - Poster

HK 39.59: Poster

Mittwoch, 23. März 2011, 14:00–16:00, Foyer Chemie

Triple-GEM Detector for the Readout of a TPC — •Martin Berger — Excellence Cluster “Universe“, TU München, Boltzmannstr. 2, 85748 Garching Germany

A Time-Projection-Chamber (TPC) allows to do a full 3D track reconstruction in combination with a precise energy-loss measurement for particle identification. Up to now it was not possible to operate a TPC in a continuous mode due to back drifting secondary ions from the amplification stage. This can be overcome by using GEM foils for the amplification, exploiting the intrinsic ion back flow suppression of the GEM foils. A continuous read-out TPC is one option for the inner tracker of the future PANDA spectrometer which will be built at the new FAIR facility@GSI (Darmstadt, Germany).
To check the operation of this solution a prototype detector of 300 mm diameter and a drift length of 725 mm with the GEM stack and readout detachable from the fieldcage was build. Tests for the commissioning of the GEM stack with an analog readout and an Fe⁵⁵ source have been done.
For the read-out of the GEM stack front-end electronics based on the AFTER/T2K chip were developed. The detector description, results of the GEM stack evaluation, front-end noise properties and some first experimental results achieved under realistic beam conditions within FOPI@GSI will be presented in this contribution. This work has been supported by Excellence Cluster ’Universe’ and Helmholtz Gesellschaft.