Münster 2017 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 8: HK+T Joint Session I: Gas Detectors/TPC
HK 8.2: Vortrag
Montag, 27. März 2017, 17:15–17:30, F 102
Studies of space-charge distortions in the ALICE TPC — •Ernst Hellbär1, Jens Wiechula1, Marian Ivanov2, and Ruben Shahoyan3 for the ALICE collaboration — 1Institut für Kernphysik, Goethe-Universität Frankfurt — 2GSI — 3CERN
The Time Projection Chamber (TPC) is the main tracking and particle identification detector of the ALICE experiment at the CERN LHC. With the advent of high luminosity data in LHC Run 2, unexpectedly large local distortions of the drift paths of ionization electrons are observed at the edges of specific readout chambers. These distortions are caused by ions which originate at the readout chambers, leading to local space-charge accumulation in the drift volume of the TPC. A dedicated correction procedure that was initially developed for the high-rate TPC operation in Run 3 and beyond has been implemented into the current detector calibration framework to correct the distortions with sufficient precision. The observed distortions will be shown as well as results of the investigation of their origin. Moreover, the correction procedure and its performance will be presented.
Supported by BMBF and the Helmholtz Association.