Abstract
Measuring the neutrino mass is one of the most compelling issues in particle physics. HOLMES is an experiment for a direct measurement of the neutrino mass. HOLMES will perform a precise measurement of the end point of the electron capture decay spectrum of \(^{163}\hbox {Ho}\) in order to extract information on the neutrino mass with a sensitivity as low as 1 eV. HOLMES, in its final configuration, will deploy a 1000-pixel array of low-temperature microcalorimeters: each calorimeter is made of an absorber, where the Ho atoms will be implanted, coupled to a transition-edge sensor (TES) thermometer. The detectors will be operated at the working temperature of \(100\,\hbox { mK}\) provided by a dilution refrigerator. In order to read out the 1000-detector array of HOLMES, a multiplexing system is necessary: the choice is to couple the transition-edge sensors to a multiplexed rf-SQUID. In this contribution we outline the progress made towards the final configuration of HOLMES regarding both the performances of the TES detectors and the characteristics of the multiplexing system.
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Acknowledgements
The HOLMES experiment is funded by the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007–2013)/ERC Grant Agreement No. 340321. We also acknowledge the support from INFN through the MARE project and from the NIST Innovations in Measurement Science programme for the TES detector development.
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Puiu, A., Becker, D., Bennett, D. et al. Updates on the Transition-Edge Sensors and Multiplexed Readout for HOLMES. J Low Temp Phys 193, 1167–1173 (2018). https://doi.org/10.1007/s10909-018-1950-z
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DOI: https://doi.org/10.1007/s10909-018-1950-z