München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 63: Instrumentation XIV

HK 63.3: Talk

Friday, March 22, 2019, 14:45–15:00, HS 12

Space-charge distortions in the ALICE TPC — •Ernst Hellbär — Institut für Kernphysik, Goethe-Universität Frankfurt

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 (2015– 2018), 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. Extensive studies have been performed to understand the exact origin of the space charge and the mechanism responsible for it. Along with this effort, a way to significantly mitigate the distortions has been found to achieve the best performance possible of the TPC in the latest heavy-ion run at the end of 2018.

Supported by BMBF and the Helmholtz Association.