High impedance TES bolometers for EDELWEISS
S. Marnieros, E. Armengaud, Q. Arnaud, C. Augier, A. Beno\^it, L., Berg\'e, J. Billard, A. Broniatowski, P. Camus, A. Cazes, M. Chapellier, F., Charlieux, M. De J\'esus, L. Dumoulin, K. Eitel, J.-B. Fillipini, D., Filosofov, J. Gascon, A. Giuliani, M. Gros, Y. Jin, A. Juillard
TL;DR
This paper presents the development and testing of high impedance TES bolometers for the EDELWEISS dark matter detection project, focusing on sensor design, superconducting properties, and detector optimization.
Contribution
It introduces high impedance NbxSi1-x TES thermistors with spiral designs for improved phonon detection in germanium cryogenic detectors.
Findings
Successful calibration of a 200 g Ge detector using neutron activation.
Demonstrated superconducting transition behavior suitable for dark matter detection.
Optimized detector sensitivity to out-of-equilibrium phonons.
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 out-of-equilibrium 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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