Berlin 2005 – scientific programme

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TT: Tiefe Temperaturen

TT 28: Superconductivity - Applications I : Cryodetectors

TT 28.4: Talk

Tuesday, March 8, 2005, 15:00–15:15, TU H104

Development of Detectors for High Count Rate Calibration Measurements in CRESST — •Wolfgang Westphal, Franz von Feilitzsch, Wolfgang Rau, Walter Potzel, Michael Stark, Thomas Jagemann, Jan König, Chiara Coppi, and Hesti Wulandari — Technische Universität München, Physik Department E15, James-Franck-Strase, 85748 Garching

CRESST is an experiment for the direct search of dark matter particles (WIMPs) using cryogenic detectors. The detectors are designed as "‘double detectors"’ for the simultaneous measurements of the phonon signal and the scintillation light of a recoil event in a CaWO₄ crystal. The phonon signal is read out via a tungsten transition edge sensor evaporated directly onto the crystal. For the measurement of the light signal there is a silicon light detector mounted together with the CaWO₄ inside a reflective housing. This design allows for discriminating the relevant nuclear recoils from the background electron recoils due to the different light output of those event types.

At TU München we are performing calibration measurements for the better understanding of the detector response on various event types (e.g. neutrons scattering on different nuclei). For this purpose we are developing a special version of the CRESST detector optimized for higher count rates. In our design we are using a TES based on Iridium/Gold-Multilayers instead of tungsten. We will report on the latest results of our developments.