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High Impedance TES Bolometers for EDELWEISS

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Abstract

The EDELWEISS collaboration aims for direct detection of light dark matter using germanium cryogenic detectors with low threshold phonon sensor technologies and efficient charge readout designs. We describe here the development of Ge bolometers equipped with high impedance thermistors based on a NbxSi1−x TES alloy. High aspect ratio spiral designs allow the TES impedance to match with JFET or HEMT front-end amplifiers. We detail the behavior of the superconducting transition properties of these sensors and the detector optimization in terms of sensitivity to a-thermal phonons. We report preliminary results of a 200 g Ge detector that was calibrated using 71Ge activation by neutrons at the LSM underground laboratory.

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Funding

This project was funded by Institut National de Physique Nucléaire et de Physique des Particules.

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Correspondence to S. Marnieros.

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Marnieros, S., Armengaud, E., Arnaud, Q. et al. High Impedance TES Bolometers for EDELWEISS. J Low Temp Phys 211, 214–219 (2023). https://doi.org/10.1007/s10909-022-02899-2

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  • DOI: https://doi.org/10.1007/s10909-022-02899-2

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