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T: Fachverband Teilchenphysik

T 44: Gasgefüllte Detektoren

T 44.8: Vortrag

Dienstag, 26. März 2019, 17:50–18:05, ST 3

Studies on Temperature Effects in GridPix-based Detectors — •Lucian Scharenberg, Klaus Desch, Jochen Kaminski, and Tobias Schiffer — Physikalisches Institut, Universität Bonn

The GridPix technology is a read-out structure of gaseous detectors. It combines a MicroMegas-like gas amplification stage with a pixelised read-out, the Timepix ASIC. Capable of detecting single ionisation electrons, the advantages of the GridPix are a high spatial resolution and a good energy resolution. Thus the GridPix is the ideal detector technology for low background experiments, like the search for solar axions at the CERN Axion Solar Telescope (CAST) or its successor, the International Axion Observatory (IAXO).

During the development of a new detector for CAST a strong thermal influence on the detector operation was observed, which was related to the power consumption of the increased number of Timepix ASICs. It could be solved by installing an active water cooling. Nevertheless, a better understanding of the observed behaviour was pursued, since the development of a new detector for IAXO is considered. There the successor ASIC, the Timepix3, shall be used as read-out ASIC, which consumes about twice as much power as the Timepix.

Within this talk, the efforts to understand and quantify the temperature effects in GridPix-based detectors are presented. The dedicated test set-up, simulations, and results of the measurements are shown.