Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 35: Instrumentation XI

HK 35.3: Talk

Wednesday, February 28, 2018, 14:30–14:45, Audimax H1

Investigation of ion transport properties of a GEM-stack — •Fabian Liebske for the ALICE collaboration — Institut für Kernphysik - Goethe Universität Frankfurt, Frankfurt am Main, Germany

With the Upgrade of the ALICE Time Projection Chamber (TPC) it is planned to replace the present MWPC-based readout chambers with detectors that employ stacks of Gas Electron Multipliers (GEMs). A key parameter of a GEM stack is the amount of ions that emerges from the amplification holes back into the drift volume. It limits the rate capability of the system because excessive ion back-flow leads to space-charge distortions of the drift field. In order to investigate the ion transport properties of GEM stacks, a dedicated test setup was developed. In a reversed-field configuration, ion currents can be studied in detail without the disturbing effects of electrons from amplification avalanches. In this talk, the test setup will be presented and results on the ion transport properties will be discussed.