Progress in the development of TES microcalorimeter detectors suitable for neutrino mass measurement

TL;DR

This paper discusses the development and testing of TES microcalorimeter detectors for the HOLMES experiment, aiming to measure neutrino mass with high precision using advanced microwave multiplexing technology.

Contribution

It presents the latest progress in TES detector development, including performance metrics and microwave multiplexing techniques for large-scale neutrino mass measurement.

Findings

Detectors achieved improved noise and energy resolution.

Microwave multiplexing effectively read out large detector arrays.

Performance meets the requirements for HOLMES experiment.

Abstract

The HOLMES experiment will perform a precise calorimetric measurement of the end point of the Electron Capture (EC) decay spectrum of 163Ho in order to extract information on neutrino mass with a sensitivity below 2 eV. In its final configuration, HOLMES will deploy 1000 detectors of low-temperature microcalorimeters with implanted 163Ho nuclei. The baseline sensors for HOLMES are Mo/Cu TESs (Transition Edge Sensors) on SiNx membrane with gold absorbers. Considering the large number of pixels and an event rate of about 300 Hz/pixel, a large multiplexing factor and a large bandwidth are needed. To fulfill this requirement, HOLMES will exploit recent advances in microwave multiplexing. In this contribution, we present the status of the activities in development, the performances of the developed microwave-multiplexed readout system, and the results obtained with the detectors specifically designed for HOLMES in terms of noise, time, and energy resolutions