High-resolution high-speed microwave-multiplexed low temperature microcalorimeters for the HOLMES experiment

B. Alpert; D. Becker; D. Bennet; M. Biasotti; M. Borghesi; G. Gallucci; M. De Gerone; M. Faverzani; E. Ferri; J. Fowler; J. Gard; A. Giachero; J. Hays–Wehle; G. Hilton; J. Mates; A. Nucciotti; A. Orlando; G. Pessina; A. Puiu; C. Reintsema; D. Schmidt; D. Swetz; J. Ullom; L. Vale

doi:10.1140/epjc/s10052-019-6814-4

EPJ

High-resolution high-speed microwave-multiplexed low temperature microcalorimeters for the HOLMES experiment

B. Alpert¹, D. Becker¹, D. Bennet¹, M. Biasotti², M. Borghesi³^,4, G. Gallucci², M. De Gerone², M. Faverzani³^,4^*, E. Ferri³^,4, J. Fowler¹, J. Gard¹, A. Giachero³^,4, J. Hays–Wehle¹^,4^,5, G. Hilton¹, J. Mates¹, A. Nucciotti³^,4, A. Orlando³^,4^,6, G. Pessina⁴, A. Puiu³^,4, C. Reintsema¹, D. Schmidt¹, D. Swetz¹, J. Ullom¹ and L. Vale¹

¹ National Institute of Standards and Technology (NIST), Boulder, CO, 80305, USA
² Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Genova, Genoa, 16146, Italy
³ Dipartimento di Fisica “G. Occhialini”, Università di Milano - Bicocca, Milan, 20126, Italy
⁴ Istituto Nazionale di Fisica Nucleare (INFN), Sezione di Milano-Bicocca, Milan, 20126, Italy
⁵ Present address: NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA
⁶ Present address: Cardiff University, Cardiff, CF24 3AA, UK

Received: 23 November 2018
Accepted: 28 March 2019
Published online: 4 April 2019

Abstract

We present the first performance results obtained with microwave multiplexed Transition Edge Sensors prototypes specifically designed for the HOLMES experiment, a project aimed at directly measuring the electron neutrino mass through the calorimetric measurement of the

Ho electron capture spectrum. The detectors required for such an experiment feature a high energy resolution at the Q–value of the transition, around

2.8 keV, and a fast response time combined with the compatibility to be multiplexed in large arrays in order to collect a large statistics while keeping the pile-up contribution as small as possible. In addition, the design has to be suitable for future ion-implantation of

Ho. The results obtained in these tests allowed us to identify the optimal detector design among several prototypes. The chosen detector achieved an energy resolution of (4.5 ± 0.3) eV on the chlorine K

line, at

2.6 keV, obtained with an exponential rise time of 14

s. The achievements described in this paper pose a milestone for the HOLMES detectors, setting a baseline for the subsequent developments, aiming to the actual ion-implantation of the

Ho nuclei. In the first section the HOLMES experiment is outlined along with its physics goal, while in the second section the HOLMES detectors are described; the experimental set-up and the calibration source used for the measurements described in this paper are reported in Sects. 3 and 4, respectively; finally, the details of the data analysis and the results obtained are reported in Sect. 6.

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EPJ

High-resolution high-speed microwave-multiplexed low temperature microcalorimeters for the HOLMES experiment

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