Aachen 2019 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 54: Direkte Suche nach Dunkler Materie III

T 54.7: Vortrag

Mittwoch, 27. März 2019, 17:40–17:55, H09

Production and investigation of radiopure CaWO₄ crystals for the CRESST experiment — •Angelina Kinast¹, Andreas Erb^1,2, Andreas Erhart¹, Alexander Langenkämper¹, Elizabeth Mondragón¹, Andrea Münster¹, Tobias Ortmann¹, Luca Pattavina¹, Walter Potzel¹, Stefan Schönert¹, Raimund Strauß¹, and Michael Willers¹ — ¹Physik-Department E15, Technische Universität München, D-85747 Garching, Germany — ²Walther-Meißner-Institut für Tieftemperaturforschung, D-85748 Garching, Germany

The direct dark matter search experiment CRESST (Cryogenic Rare Event Search with Superconducting Thermometers) uses scintillating CaWO₄ single crystals as targets for potential recoils of dark matter particles. For several years these CaWO₄ crystals have been produced in-house at Technische Universität München (TUM) via Czochralski growth from the raw materials CaCO₃ and WO₃. Thereby, extensive powder purification procedures have been applied. In a next step, TUM aims for minimizing the internal stresses of the CaWO₄ crystals. For this a COMSOL-simulation of the growth process was developed. In this talk the results of this simulation will be presented. In addition, the status of the alpha screening measurements planned at TUM, which are an important tool for characterization of TUM-grown crystals, will be presented. This research was supported by the DFG cluster of excellence "Origin and Structure of the Universe", by the BMBF Verbundprojekt 05A2017 CRESST-XENON and by the SFB1258.