Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 51: Poster (a)

HK 51.12: Poster

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

Pre-Commissioning of the ALICE TPC and Common Mode Analysis — •Panagiota Chatzidaki for the ALICE collaboration — Physikalisches Institut der Universität Heidelberg

In order to operate the ALICE Time Projection Chamber (TPC) in continuous mode, recording the full minimum-bias interaction rate of 50 kHz in Pb−Pb, as anticipated at the LHC in Run 3 (2021−2023) and beyond, the gated Multi Wire Proportional Chambers (MWPCs) were replaced by GEM-based readout chambers (Gas Electron Multipliers). After the assembly and before commissioning of the TPC underground, a pre-commissioning in the clean room at the LHC Point 2 was performed during November 2019−February 2020, in order to ensure the functionality of all readout chambers (ROCs) and Front End Electronics (FEE). During that time, dedicated pedestal and noise measurements, calibration pulser measurements, as well as measurements with the TPC laser system were essential in developing algorithms that will perform online and offline corrections during the normal TPC operation with beam. Crucial is the correction of the Common Mode Effect, which, if not accounted for, results in a significant deterioration of the dE/dx resolution, and therefore the particle identification performance of the TPC. We describe the pre-commissioning steps, and present the status of the analysis of the Common Mode Effect, by studying non-zero-suppressed laser events.