An automated system to define the optimal operating settings of cryogenic calorimeters

TL;DR

This paper introduces automated measurement and analysis procedures to optimize the bias current of NTD thermistors in cryogenic calorimeters, enhancing detector performance and scalability for large arrays like CUORE and CUPID.

Contribution

The paper presents novel automated procedures for characterizing and optimizing NTD thermistor settings in large cryogenic detector arrays, improving reliability and efficiency.

Findings

Enabled reliable characterization of numerous detectors

Optimized bias current for improved energy resolution

Procedures applicable to large-scale cryogenic detector arrays

Abstract

Cryogenic macro-calorimeters instrumented with NTD thermistors have been developed for several decades. The choice of the optimal bias current is crucial for a proper operation of these detectors, both in terms of energy resolution and stability. In this paper we present a set of automatic measurements and analysis procedures for the characterization and optimization of the working configuration of the NTD thermistors. The presented procedures were developed for CUORE, an array of 988 cryogenic macro-calorimeters instrumented with NTD thermistors that has been taking data since 2017. These procedures made it possible to characterize a large number of detectors in a reliable way. They are suitable enough to be used also in other large arrays of cryogenic detectors, such as CUPID.