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HK: Fachverband Hadronen und Kerne

HK 67: Poster Session

HK 67.99: Poster

Donnerstag, 19. März 2009, 14:00–16:00, Audi-Max

Determination of the Gas Amplification in the ALICE Transition Radiation Detector — •Patrick Reichelt — Institut für Kernphysik Frankfurt

The Transition Radiation Detector (TRD) of the ALICE experiment at the LHC provides excellent electron/pion discrimination. The measurement principle is based on the recognition of high charge deposition mostly caused by the TR-signal produced by the electron. The initially produced charges are multiplied near the anode wires of the TRD-chamber. This gas amplification factor can be determined by using a γ-source of known power and comparing the calculated primary ionization to the measured anode-current. A systematic study of the gas gain will be presented.

Since the TRD will work at 1 mbar above atmospheric pressure, which is subject to continuous change, the pressure dependency of the gas gain has been studied. The effect of the differential pressure on chamber geometry and gas gain will be compared to design specifications in the Technical Design Report of the TRD.