Hamburg 2016 – scientific programme

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T: Fachverband Teilchenphysik

T 73: Spurkammern

T 73.6: Talk

Wednesday, March 2, 2016, 18:05–18:20, VMP8 SR 05

Investigations of the long-term stability of a GEM-TPC — •Oleksiy Fedorchuk for the LCTPC-Deutschland collaboration — Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Deutschland — Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg, Deutschland

For the International Large Detector (ILD) at the planned International Linear Collider (ILC) a Time Projection Chamber (TPC) is foreseen as the main tracking detector. The gas amplification will be done by Micro Pattern Gaseous Detectors (MPGD). One option is to use Gas Electron Multipliers (GEM).While the applicability of GEMs for the gas amplification in a TPC readout has been shown, the focus of the current research is to improve the high voltage stability and reliability of the readout modules. This is a crucial requirement for the operation in the final ILD TPC.

The main focus of the research presented in this talk is on studies of the discharge stability and operational features of large area 22×18cm² GEM foils. We present systematic studies of the stability of GEM foils under different operation conditions. These studies include measurements and calculations of the dynamic behavior of charges in the GEM foils after a trip. The results will be used to develop methods to avoid destructive discharges in the final readout module.