Bochum 2018 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 50: Instrumentation XV

HK 50.1: Gruppenbericht

Donnerstag, 1. März 2018, 14:00–14:30, Audimax H1

Upgrade of the ALICE TPC — •Robert Münzer for the ALICE collaboration — Institut für Kernphysik - Goethe Universität, Frankfurt, Germany — CERN, Geneva, Germany

During the long shutdown 2 (LS2) of the LHC in 2019-2020, the ALICE TPC will be upgraded to be able to take data at the increased luminosity expected for Run 3. During LS2, the present multi-wire proportional chambers (MWPC) will be replaced by chambers based on Gas Electron Multiplier (GEM) technology, keeping the spatial and energy resolution of the present TPC. This allows to overcome the intrinsic rate limitation imposed by the necessity of a gating grid for MWPC-based readout and reading out continuously at Pb-Pb interaction rates up to 50 kHz at limited space-charge distortions.
The use of GEM technology together with the continuous readout mode requirement asked for a complete re-design of the readout electronics. Furthermore, an advanced high-voltage power supply concept is required, based on so-called cascaded power supply modules.
After an extensive R&D program, carried out during the last years, the mass production of the 80 quadruple-GEM readout chambers has been started in 2017. To ensure an adequate performance of the new chambers, an advanced quality assurance and testing procedures across various construction institutes was established.
In this presentation, the recent status of the ongoing activities will be presented.
This work is supported by BMBF and HGF