Regensburg 2007 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 30: Superconductivity - Cryodetectors
TT 30.4: Talk
Thursday, March 29, 2007, 17:45–18:00, H20
Optimization of the Czochralski Growth Process for CaWO4 Detector Crystals — •Christian Ciemniak1, Chiara Coppi1, Andreas Erb2,3, Franz von Feilitzsch1, Christian Isaila1, Jean-Côme Lanfranchi1, Sebastian Pfister1, Walter Potzel1, Wolfgang Rau1, Sabine Roth1, and Wolfgang Westphal1 — 1Physikdepartment E15, Technische Universität München, James-Franck-Straße, 85748 Garching — 2Walther-Meißner-Institut, Walther-Meißner-Straße 8, 85748 Garching — 3Kristallabor, Technische Universität München, James-Franck-Straße, 85748 Garching
CRESST is an experiment for the direct detection of dark matter (WIMPs). The expected very low event rates and the low energy transfer in the keV range demand low background rates and sensitive detectors. Thus the need for detector crystals with good optical and phonon properties combined with high radioactive purity arises. To achieve these goals, the control over the raw materials and their processing, in particular the crystal growth, are important. In an ongoing effort at the Physikdepartment E15, the Czochralski Growth Process of CaWO4 detector crystals is optimized to meet these requirements. We report on first results.
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).