Dresden 2013 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 68: Instrumentation

HK 68.1: Vortrag

Donnerstag, 7. März 2013, 14:00–14:15, HSZ-405

Offline Signal Tail-Correction for the ALICE TPC — •Mesut Arslandok — Institut für Kernphysik (IKF), Goethe Universität, Max-von-Laue-Str. 1 60438 Frankfurt am Main

The ALICE Time Projection Chamber (TPC) is the main tracking and particle identification (PID) detector of ALICE at the CERN-LHC. It was designed for multiplicities of up to 20,000 primary and secondary charged particles emerging from a single central Pb-Pb collision. The PID in the TPC is calculated from the specific energy loss measurement (dE/dx), which is derived from the pulse height distribution of charged particle tracks measured along 159 read-out planes. The signals from the Multi Wire Proportional Chambers (MWPC) show a characteristic long undershoot after the signal, which is due to the long ion drift times in the MWPC amplification region. Such an "ion tail" may lead to a loss of signal amplitude for the following signals on the same readout pad. Eventually, this results in a deterioration of the dE/dx resolution, in particular in the high multiplicity environment of Pb-Pb collisions. In this study, an offline correction method is presented which is expected to improve the dE/dx resolution and thus the PID quality of TPC. The method will be applied to the Pb-Pb collision data set taken in 2010 and 2011. Details of the correction procedure and first results will be presented.