Bonn 2020 – scientific programme
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T: Fachverband Teilchenphysik
T 53: Dark Matter II
T 53.7: Talk
Wednesday, April 1, 2020, 18:00–18:15, H-HS XIV
Transition Edge Sensor Production for Rare-Event Searches — •Tobias Ortmann1, Margarita Kaznacheeva1, Angelina Kinast1, Alexander Langenkämper1, Elizabeth Mondragón1, Luca Pattavina1, Walter Potzel1, Johann Riesch2, Stefan Schönert1, Raimund Strauss1, and Victoria Wagner1 — 1Technische Universität München, Physik Department, Lehrstuhl E15, James-Franck-Str. 1, D-85748 Garching — 2Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, D-85748 Garching
The CRESST and the NUCLEUS experiments are aiming for the detection of low-energetic nuclear recoil events (<100eV) induced by elastic scattering of dark matter particles or reactor antineutrinos, respectively. In both cases the detectors are operated as cryogenic calorimeters at mK temperatures and the phonon signals are read out by W thin-film transition edge sensors. For future large scale production, to simplify the production cycles and to improve sensitivity, the application of magnetron sputtering is investigated in terms of film quality and reproducibility. Using X-ray diffractometry we established a preselection procedure of films for cryogenic measurements. First results from a prototype TES produced at the Max Planck Institute for Plasma Physics with a transition temperature of 35 mK are presented. This work was supported by the DFG Excellenzclusters UNIVERSE and ORIGINS, the SFB 1258, the ERC StG-2018 "NU-CLEUS" and the Maier-Leibnitz-Laboratory (Garching).