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TT: Tiefe Temperaturen

TT 13: Messger
äte, Kryotechnik

TT 13.6: Vortrag

Dienstag, 9. März 2004, 17:30–17:45, H20

Detector developement for calibration measurements in CRESST — •Wolfgang Westphal, Franz von Feilitzsch, Thomas Jagemann, Josef Jochum, Walter Potzel, Wolfgang Rau, Marco Razeti, Michael Stark, and Hesti Wulandari — Technische Universität München, Physik-Department E15, James-Franck-Strasse, D-85748 Garching

CRESST searches for Dark Matter Particles (WIMPs) by means of elastic scattering on nuclei in cryogenic detectors. The main background are electron recoils iduced by radioactivity. Our target (CaWO₄) is a scintillator, which has lower light output for nuclear recoils than for electron recoils allowing us to discriminate this background. The detectors consist of a 300 g crystal with a Tungsten Transition Edge Sensor (TES) to measure the thermally deposited energy, enclosed in a reflecting housing together with a light detector. These detectors are designed for low count rates as expected for the experiment.

To understand the detector response to nuclear recoils we plan a calibration experiment with a neutron beam, requiring high count rates. The same holds for an experiment studying recoiling nuclei from alpha-decays, one of the remaining backgrounds. Therefore we have developed faster detectors, using Ir/Au TES operated in the electro thermal feedback mode. We will discuss the latest results of this developement.