Hamburg 2016 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 23: Postersitzung

T 23.10: Poster

Montag, 29. Februar 2016, 13:30–14:30, VMP4 Foyer

Chemical purification of CaCO₃ and CaWO₄ powders used for CaWO₄ crystal production for the CRESST experiment — •H. H. Trinh Thi, X. Defay, A. Erb, R. Hampf, J.-C. Lanfranchi, A. Langenkämper, V. Morgalyuk, A. Münster, E. Mondragon, C. Oppenheimer, W. Potzel, S. Schönert, H. Steiger, A. Ulrich, S. Wawoczny, M. Willers, and A. Zöller — Physik-Department and Excellence Cluster Universe, Technische Universität München, D-85748 Garching

CRESST (Cryogenic Rare Event Search with Superconducting Thermometers) uses CaWO₄ single crystals as targets for the direct search for dark matter particles. Since several years these CaWO₄ crystals are grown at the Technische Universität München. Thereby, commercially available CaCO₃ and WO₃ powders are used for the synthesis of CaWO₄ powder. For the experiment low intrinsic contaminations of the crystals play a crucial role. In order to improve the radiopurity of the crystals it is necessary to reduce potential sources for radioactive backgrounds such as U and Th. In this poster we will present our studies of the chemical purification of the CaCO₃ and CaWO₄ powders. This research was supported by the DFG cluster of excellence "Origin and Structure of the Universe", by the Helmholtz Alliance for Astroparticle Physics, by the Maier-Leibnitz-Laboratorium (Garching), by the BMBF.