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HK: Fachverband Physik der Hadronen und Kerne

HK 52: Poster

HK 52.44: Poster

Donnerstag, 1. März 2018, 16:30–18:45, Audimax Foyer

Modification of the GEM response due to etching effects from high irradiation — •Michael Jung for the ALICE collaboration — Institut für Kernphysik Frankfurt

For the Upgrade of the ALICE Time Projection Chamber (TPC) with Gas Electron Multipliers (GEMs) an aging test setup was built to evaluate the long-term performance of GEMs in high-luminosity experiments. These tests revealed that the insulating kapton layer between the copper electrodes is worn out after long-term operation of the GEM stack with high gain. This phenomenon, which is changing the hole geometry of the irradiated area, leads to a modification of the GEM response, which is now investigated with simulations of a single GEM. The simulations of the electric fields were performed with ANSYS 16.1 and the operation process of the detector is simulated with the Garfield⁺⁺ toolkit.

The simulations focus on the details of the amplification process to understand the change in gain and multiplication of etched GEMs as well as the decrease of the energy resolution.