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T: Fachverband Teilchenphysik
T 53: Dark Matter II
T 53.8: Vortrag
Mittwoch, 1. April 2020, 18:15–18:30, H-HS XIV
High-Purity CaWO4 Crystals for the CRESST Dark Matter Search — •Angelina Kinast1, Andreas Erb1,2, Margarita Kaznacheeva1, Alexander Langenkämper1, Elizabeth Mondragon1, Tobias Ortmann1, Luca Pattavina1, Walter Potzel1, Stefan Schönert1, Raimund Strauss1, and Victoria Wagner1 — 1Physik Department E15, Technische Universität München, D-85748 Garching — 2Walther-Meißner-Institut für Tieftemperaturforschung, D-85748 Garching
The direct dark matter search experiment CRESST uses scintillating CaWO4 single crystals as a target for potential recoils of dark matter particles. For several years, CaWO4 crystals have been produced in-house at TUM via Czochralski growth from the raw materials CaCO3 and WO3. In order to achieve the future background goals of CRESST, extensive powder purification procedures, e.g. by using the precipitation method, have been developed and applied. Recently the first crystal from this purified material was grown and has been installed as a cryogenic detector in the CRESST setup at the Gran Sasso underground laboratory. Moreover, I will present the status of a dedicated cryogenic alpha screening facility at the TUM shallow underground laboratory (UGL), which will be an important tool to characterize the intrinsic radio purity of single crystals. This research was supported by the DFG cluster of excellence Origins, by the BMBF Verbundprojekt 05A2017 CRESST-XENON and by the SFB1258.