Regensburg 2007 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity - Cryodetectors

TT 30.3: Talk

Thursday, March 29, 2007, 17:30–17:45, H20

Detectors for Calibration Measurements in CRESST — •Wolfgang Westphal, Christian Ciemniak, Chiara Coppi, Franz von Feilitzsch, Achim Gütlein, Christian Isaila, Jean-Côme Lanfranchi, Sebastian Pfister, Walter Potzel, Wolfgang Rau, Sabine Roth, and Michael Stark — Physik-Department E15, Technische Universität München, James-Franck-Straße, 85748 Garching

The CRESST (=Cryogenic Rare Event Search with Superconducting Thermometers) experiment searches for dark matter particles (Weakly Interacting Massive Particles, WIMPs) via nuclear scattering using cryogenic detectors. The simultaneous measurement of the phonon signal and the scintillation light from the target CaWO₄ crystal allows to veto effectively background from βs and γs due to the different light output for electron and nuclear recoils. At the TU München we are performing calibration measurements for the better understanding of the detector response to 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. These detectors consist of a smaller CaWO₄ crystal (10 – 38 g instead of 300 g) together with a cryogenic light detector, both equipped with Ir/Au transition edge sensors. We will report on the latest results of these developments. This work has been supported by funds of the DFG (SFB 375, Transregio 27: Neutrinos and Beyond), the Munich Cluster of Excellence (Origin and Structure of the Universe) and the Maier-Leibnitz-Laboratorium (Garching).