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HK: Fachverband Hadronen und Kerne

HK 41: Accelerators and Instrumentation II

HK 41.6: Vortrag

Dienstag, 17. März 2009, 18:00–18:15, H-ZO 90

Calibration of the ALICE Transition Radiation Detector with cosmic-ray data — •Bailhache Raphaelle — Institut für Kernphysik, Frankfurt, Deutschland

The ALICE Experiment is the dedicated heavy-ion experiment installed at the Large Hadron Collider (LHC). One of its detector systems, the Transition Radiation Detector (TRD), is a gas detector designed for electron identification and charged particle tracking. The charged particle ionizes the gas along its path and electrons drift in a uniform field of 700 V/cm over 3 cm before being amplified. We implemented procedures to calibrate the drift velocity of the electrons, the time-offset of the signal, the amplification factor and the width of the Pad Response Function (PDF) characterizing the sharing of the deposited charge over adjacent pads. The performances of the algorithms were tested on first real data taken with cosmic-rays in the ALICE setup. The calibration software was installed on the main ALICE data acquisition system at CERN and executed continuously during the cosmic-ray data taking in 2008, providing a first determination of the calibration constants. In this talk, we will discuss the implementation of the calibration software and the results obtained with the first four TRD supermodules installed in ALICE.