Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 35: Instrumentation und Anwendungen

HK 35.2: Group Report

Tuesday, March 8, 2005, 17:00–17:30, TU MA144

ALICE TRD - Report on the first beam test with a real size, 6-layer, series production detector stack — •David Emschermann — Physikalisches Institut, Universität Heidelberg, Germany

The ALICE Transition Radiation Detector (TRD) consists of 540 individual detector chambers offering close to 1.2 million channels on a total area of roughly 750 m². It is arranged in a six layer barrel geometry in the central part of the ALICE detector. Apart from providing charged particle tracking and electron identification, the TRD will give fast electron trigger decisions within 6 µ s after the heavy ion collisions.

Series production of TRD chambers has started end of 2003. We report on measurements using a stack of the first six series production chambers partly equipped with final readout electronics. End of October 2004 this stack was installed at CERN for a beam test with particle momenta up to 10 GeV/c. The objectives of this beam test included measurements of : electron identification performance, position resolution with tilted pad geometry and dependence of detector response on variation of incident particle angles and momenta. An overview on the preparation and on results of the beam test will be presented.