Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 52: Suche nach dunkler Materie III

T 52.10: Vortrag

Mittwoch, 21. März 2018, 18:55–19:10, Philo-HS5

Characterization of Sputtered Tungsten Thin Films for the CRESST Experiment using Transition Measurements and X-Ray Diffraction — •Tobias Ortmann, Angelina Kinast, Erik Lindner, Elizabeth Mondragón, Andrea Münster, Walter Potzel, Stefan Schönert, Andreas Ulrich, Stephan Wawoczny, and Michael Willers — Physikdepartment E15 and Excellence Cluster Universe, Technische Universität München, D-85748 Garching

The CRESST experiment (Cryogenic Rare Event Search with Superconducting Thermometers) searches for nuclear recoils events induced by elastic scattering of dark matter particles off the target nuclei within CaWO₄ target crystals. The detectors are operated at a temperature of O(10 mK) and consist of the target crystal and a separate cryogenic light detector. Both heat (phonon) and light signals are read out via a tungsten TES (Transition Edge Sensor) utilizing the superconducting phase transition of tungsten to measure the energy deposited in the respective absorbers. RF-magnetron sputtering is promising method to produce the tungsten thin films for the TES. It provides a high production rate, highly tunable transition temperatures and it produces mechanically stable films. The thin film production via this method is investigated in terms of film quality reproducibility using transition measurements and x-ray diffractometry and the results of this investigation are 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.