Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 22: Postersitzung
HK 22.58: Poster
Montag, 7. März 2005, 16:30–18:00, TU MA141
Experimental Evaluation of the ALICE TPC Front-End Electronics Cooling Strategy — •U. Frankenfeld, P. Braun-Munzinger, H.R. Schmidt, and J. Wiechula — Gesellschaft für Schwerionenforschung, Darmstadt
The Time Projection Chamber (TPC) is the main tracking detector of the ALICE Experiment at the CERN Large Hadron Collider (LHC). A gas-filled, cylindrical volumen of 88 m3 composes the sensitive region of the TPC. The maximal drift length is 2.5 m. The readout chambers are arranged in 18 trapezoidal sectors at both ends of the cylinder. The electron drift velocity changes by ∼0.3%/K for the nominal gas mixture of Ne (90%) and CO2 (10%) and a drift field of 400 V/cm. This leads to the requirement for the temperature stability and homogeneity within the TPC drift volume of ΔT<0.1∘C. The main heat source is the Front-End Electronics (FEE) of the detector itself, with a total heat dissipation of ∼30kW. The FEE is connected with kapton cables to the readout chambers. A cooling strategy has been worked out to fulfill the thermal requirement. To verify the cooling strategy tests with a readout chamber module in a thermal controlled environment have been carried out. Results of actual measurements of the heat transfer and cooling efficiencies will be presented.