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HK: Fachverband Physik der Hadronen und Kerne

HK 48: Instrumentation X

HK 48.1: Gruppenbericht

Donnerstag, 2. April 2020, 14:00–14:30, J-HS C

Upgrade of the ALICE TPC — •Tariq Mahmoud for the ALICE collaboration — University of Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Bonn, Germany

After the Long Shutdown 2 (2019−2020), the LHC will deliver Pb-Pb-collisions with a minimum-bias interaction rate of 50 kHz. In order to make full use of the increased luminosity, the TPC, which is the main tracking and particle identification device of ALICE, is currently being upgraded with readout chambers (ROC) based on Gas Electron Multipliers (GEM). These avoid the long dead-time of the order of 200 µs generated by the ion gate and hence allow for continuous operation and readout. In summer 2019 the TPC was equipped with new GEM ROCs that had been constructed and tested in a collaborative effort of 9 European and 4 US institutions. The HV system was also upgraded for the safe operation of GEM detectors. In order to meet the new readout conditions, a new ASIC called SAMPA was developed, which contains an internal Pre-Amp, a Shaper, and a 10-bit ADC (sampling rate of 5 MHz) with 32 channels. First successful pre-commissioning tests using ionization tracks generated by cosmic rays and a UV-laser system were carried out around mid-November 2019 with the upgraded TPC. A systematic commissioning program will be taking place throughout December 2019 till February 2020. The status of the upgraded TPC will be presented as well as the results of the commissioning program. Supported by BMBF.