Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 61: Instrumentation XVIII

HK 61.5: Talk

Thursday, March 17, 2016, 17:45–18:00, S1/01 A2

Ion backflow and energy resolution in quadruple GEM stack for the ALICE TPC upgrade — •Michael Jung, Rainer Renfordt, and Harald Appelshäuser for the ALICE collaboration — Institut für Kernphysik Frankfurt, Goethe-Universität Frankfurt, Germany

After the upgrade of the LHC at CERN the interaction rate of
Pb–Pb collisions in RUN3 will be about 50 kHz. Therefore the Time Projection Chamber (TPC) of the ALICE experiment will be upgraded with quadruple stacks of Gas Electron Multipliers (GEMs), to provide operation in continuous mode. A test detector with a quadruple GEM stack has been set up in Frankfurt to investigate the behaviour of GEMs with emphasis on ion backflow (IBF) and energy resolution by varying GEM voltages, transfer fields between GEMs and the pitch between the GEM holes. Furthermore the electron transport properties of GEM foils were studied for different GEM hole pitches.