Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 17: HK+T Joint Session III: Gas Detectors/GEM

HK 17.4: Talk

Tuesday, March 28, 2017, 11:45–12:00, F 102

Status of the Digitization for the Upgraded ALICE GEM-TPC — •Andreas Mathis¹ and Jens Wiechula² for the ALICE collaboration — ¹TU München, Physik Department E62, Excellence Cluster ’Universe’, Garching — ²Institut für Kernphysik, Goethe-Universität, Frankfurt am Main

The ALICE Collaboration is planning a major upgrade of its central barrel detectors to be able to cope with the increased LHC luminosity beyond 2019. In order to record at an increased interaction rate of up to 50 kHz in Pb–Pb collisions, the TPC will be operated in an ungated mode with continuous readout. This demands for a replacement of the currently employed gated Multi-Wire Proportional Chambers by GEM-based (Gas Electron Multiplier) readout chambers, while retaining the performance in particular in terms of particle identification capabilities via the measurement of the specific energy loss.

The increase in interaction rate and the requirements of a trigger-less, continuous readout demand for significant modifications of the front-end cards, the computing system and the corresponding calibration, reconstruction and simulation framework. In particular, the upgraded readout scheme of the TPC with GEMs requires a complete re-design of the digitization, which includes a detailed simulation of the detector response after electron amplification in a stack of four GEM-foils.

This research was supported by the DFG cluster of excellence ’Origin and Structure of the Universe’ and BMBF-Verbundprojekt ALICE at High Rate 05P15WOCA1.