Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 51: Poster (a)

HK 51.8: Poster

Thursday, April 2, 2020, 16:30–18:30, Zelt

Pad-by-Pad gain calibration of the ALICE TPC using reconstructed particle tracks — •Matthias Kleiner for the ALICE collaboration — 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. For RUN 3 starting in 2021, interaction rates of 50 kHz in Pb-Pb collisions require a major upgrade of the TPC readout system. The MultiWire Proportional Chambers (MWPCs) are replaced by stacks of four Gas Electron Multiplier (GEM) foils. Due to manufacturing tolerances, the hole diameters vary over the surface of the foils. This leads to variations in the electron amplification.

In this poster, a new self-normalizing method to calculate topological gain variations using particle tracks is presented. This method together with the high data rates allows to study variations of the gain as a dependence of time.

Supported by BMBF and the Helmholtz Association.