Bochum 2018 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 52: Poster

HK 52.41: Poster

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

A GEM PCB simulator — •Piotr Gasik and Laura Fabbietti — TU München, James-Franck-Str. 1, 85748 Garching, Germany

The key parameter for a long-term operation of GEM-based detectors in the harsh environment of high-rate experiments is their stability against electrical discharges. To mitigate the results of violent discharge events, an optimised HV system is mandatory. Behaviour of the system in case of a spark occurrence, propagated discharges or an emergency shutdown of a power supply is of a great importance. The possibility of an over-voltage across any GEM foil must be avoided as it may lead to the development of a destructive discharge. In order to test the reaction of the powering scheme on the events listed above, we have designed and built a multi-GEM detector simulator based on the conventional electronic elements. It can serve as a testing tool for the assessment of the HV scheme without a need to use a real detector.

The device allows for the simulation of a short in one of the GEM segments using HV relays or a spark occurrence by employing a Gas Discharge Tube. Voltages on electrodes in question can be monitored on a scope using standard test probes via decoupling HV capacitors, included in the design. The GEM PCB simulator has been successfully used to test several powering schemes commonly used with GEM detectors, such as: passive voltage divider, multi-channel and a so-called "cascaded" power supply. The results of these tests will be presented in the contribution.

This research was supported by the DFG cluster of excellence "Origin and Structure of the Universe".