Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 104: Search for Dark Matter V

T 104.6: Vortrag

Freitag, 4. April 2025, 10:15–10:30, VG 4.102

Characterization of a Spring-Based Passive Decoupling System with Capacitive Distance Measurements for the COSINUS Experiment — •Lutz Ziegele for the COSINUS collaboration — Max-Planck-Institut für Physik, 85748 Garching, Germany

The COSINUS experiment (Cryogenic Observatory for SIgnatures seen in Next generation Underground Searches) is a direct dark matter search, operating sodium iodide absorbers equipped with Transition Edge Sensors (TES) inside a dry dilution refrigerator. A spring-based passive decoupling system is used to reduce microphonics - one of the major non-particle background sources. To optimize the decoupling system, a profound understanding of its behavior is essential. However, a characterization of the decoupling system inside a closed cryostat at temperatures in the order of tens of milli-kelvin is not straightforward. This contribution discusses the capabilities and limitations of capacitive distance measurement sensors, which repurpose already existing refrigerator structures.

Keywords: Cryogenic; Dark matter; Spring-based passive decoupling system