Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 62: Search for Dark Matter III

T 62.9: Vortrag

Mittwoch, 2. April 2025, 18:15–18:30, VG 4.102

Evaporated Gold Thin-Films on NaI Crystals for remoTES based cryogenic Detectors — •Kilian Heim for the COSINUS collaboration — Max-Planck-Institut für Physik, Garching, Deutschland

The COSINUS (Cryogenic Observatory for SIgnatures seen in Next generation Underground Searches) experiment plans a model-independent cross-check of the DAMA/LIBRA dark matter result. Starting its first operational phase in 2025, it will use the same target material NaI, but operated at cryogenic temperatures, enabling a dual-channel readout of both a scintillation and a phonon signal. The phonon signal is read out with a TES (transition edge sensor), but due to the low melting point and hygroscopicity of the NaI crystal, the TES cannot be deposited directly on the crystal. Therefore, the so-called remoTES setup is applied, in which the TES is located on a separate wafer and only a gold pad is required on the crystal. In the latest detector prototypes, the gold pad is deposited by an evaporation process. The first tests of this design have shown promising results. To further investigate and improve the performance and behavior of the detector design, the subsequent prototypes will be tested with different crystal masses and gold pad sizes. In this contribution, I would like to highlight the upgrades taken on the absorber part of the detector over the last year and present results of the latest detector prototype tests.

Keywords: dark matter; cryogenic calorimeters; quantum sensors; sodium iodide; COSINUS