Münster 2002 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 41: Heavy Ions V

HK 41.1: Group Report

Thursday, March 14, 2002, 14:00–14:30, E

Development and Series Production of the ALICE TPC Readout Chambers — •Danilo Vranic¹, Gerd Augustinski¹, Peter Braun-Munzinger¹, Heinz Daues¹, Ulrich Frankenfeld¹, Chilo Garabatos¹, Joerg Hehner¹, Rudolf Schmidt¹, Herbert Stelzer¹, Peter Glässel², Bernd Windelband², and Rainer Renfordt³ — ¹GSI Darmstadt — ²Universität Heidelberg — ³Universität Frankfurt

The Time Projection Chamber (TPC) is the central detector of the ALICE experiment at the LHC. It is designed to operate at unprecedented particle multiplicities - up to 25000 charged particles may be produced in a central PbPb collision into the TPC acceptance. This puts special and unusual requirements on the read-out chambers. The chambers have to run, e.g., at an average gain of 20000 and with expected currents exceeding 10 micro-amperes. In this presentation we report on the design and testing of these read-out chambers and describe in detail their performance. This includes optimization of the wire and pad geometry as well as beam tests with a full size prototype at the SIS. We further report on the development of a detailed production plan for all 72 modules covering an area of about 36 sqm, including various quality control measures and acceptance tests. Finally, the actual status of the production is given.