Bochum 2009 – scientific programme
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HK: Fachverband Hadronen und Kerne
HK 41: Accelerators and Instrumentation II
HK 41.7: Talk
Tuesday, March 17, 2009, 18:15–18:30, H-ZO 90
Feasibility study on determining the effective radiation thickness of the Transition Radiation Detector of ALICE from PS data with a beam of tagged electrons and pions — •Robert Grajcarek — University of Heidelberg
The Transition Radiation Detector (TRD) of the ALICE experiment at LHC identifies electrons with momenta above 1 GeV/c and provides fast (6 µs) triggering capability for high transverse momentum charged particles (pT > 3 GeV/c). The effective radiation thickness serves as an essential input for physics analyses relying on detailed Monte Carlo detector performance studies. When electrons cross matter, they are subject to energy loss due to Bremsstrahlung. By measuring the energy distribution of electrons after traversing the TRD, it is in principle possible to determine the effective radiation thickness. We report recent results from a testbeam at the Proton Synchroton at CERN (PS) with tagged electrons and pions impinging on one of the eighteen supermodules of the TRD in its final configuration. Beam momenta with 0.3, 0.6, 1.0, 1.5, 2.0, 3.0, 4.0 and 6.0 GeV/c were used. The resulting electron energy has been measured by a lead-glass cherenkov calorimeter. In order to fully decribe the data, detailed Monte Carlo simulations were performed, including all relevant details of the experimental setup.