Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 104: Search for Dark Matter 5

T 104.3: Vortrag

Donnerstag, 24. März 2022, 16:50–17:05, T-H36

Operation of low threshold cryogenic calorimeters in a dry dilution refrigerator in the COSINUS experiment — •Moritz Kellermann, Karl-Heinz Ackermann, Henrik Ansorge, Mukund Bharadwaj, Torsten Frank, Karoline Schäffner, Robert Stadler, Martin Stahlberg, and Vanessa Zema — Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 München

For 25 years the DAMA/LIBRA dark matter search measures an annually modulated signal, using sodium iodide (NaI)-scintillators at room temperature. The COSINUS experiment aims to give a model-independent cross-check of the DAMA/LIBRA results by operating pure NaI absorber crystals as cryogenic scintillating calorimeters at mK-temperatures.

COSINUS will be among the first experiments to operate low-threshold calorimeters in a dry dilution refrigerator, being sensitive to temperature changes on a micro-Kelvin level. A pulse tube cooler will be used to arrive at 3K, trading simplified handling for an increased mechanical vibration noise level in the acoustic frequency range. In order to maintain the thermal stability to operate low-threshold calorimeters, it will be necessary to decouple the detectors from possible noise sources. For COSINUS, a spring-based passive decoupling system is planned and tested using piezo-based accelerometers at room temperature. This talk will focus on the design and test results of the in-house developed decoupling system.