Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 121: Search for Dark Matter 6

T 121.4: Talk

Friday, March 8, 2024, 09:45–10:00, Geb. 30.35: HSI

Vibration decoupling in the COSINUS dry dilution refrigerator — •Moritz Kellermann for the COSINUS collaboration — Max-Planck-Institut für Physik, 85748 Garching

Cryogenic detectors are a valuable class of detectors for rare event searches. Currently, energy resolutions and thresholds on the order of O(eV) are reached using Transition Edge Sensors (TES). However, besides detector effects, one of the dominating backgrounds limiting the sensitivity and operation stability of cryogenic detectors are microphonics which originate from vibrations produced by the refrigerator itself.

The COSINUS experiment will use a custom-made dry dilution refrigerator with a pulse tube cooler (PT) to cool down particle detectors with TES for dark matter research. To mitigate vibrations, a spring-based passive decoupling system inside of the refrigerator is currently under development in a test facility at the Max-Planck Institute for Physics (MPP) in Munich. This contribution shows the current status of the vibration system and presents first measurements of the vibration level at the lowest temperature stages.

Keywords: Vibration isolation; Dry dilution refrigerator; TES; Dark Matter