Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 39: Focus Session: Frontiers in Cryogenic Particle Detection

TT 39.7: Vortrag

Mittwoch, 18. März 2020, 18:00–18:15, HSZ 03

Development and optimisation of metallic magnetic calorimeter arrays towards ECHo-100k — •Federica Mantegazzini, Arnulf Barth, Christian Enss, Andreas Fleischmann, Loredana Gastaldo, Robert Hammann, Sebastian Kempf, Clemens Velte, and Tom Wickenhäuser — Kirchhoff-Institute of Physics, Heidelberg University, Germany

The Electron Capture in 163Ho (ECHo) experiment has been designed for the determination of the effective electron neutrino mass exploiting the electron capture spectrum of 163Ho. The detector technology is based on metallic magnetic calorimeters (MMCs) loaded with 163Ho and operated at millikelvin temperature. For the first phase of the experiment, ECHo-1k, MMC arrays consisting of 72 pixels have been microfabricated and implanted with high purity 163Ho source reaching an activity of about 1 Bq per pixel. The implanted detectors have been successfully operated and characterised, reaching an energy resolution below 5 eV. For the next phase of the experiment, ECHo-100k, the planned activity per pixel is 10 Bq and the required number of pixels simultaneously operated will be 12000. Therefore, a new dedicated MMC array chip which allows for highly efficient 163Ho implantation and multiplexed read-out as well as optimised detector performances has been designed and produced. We present preliminary results obtained in the characterisation of the ECHo-100k chip and we discuss the future plans towards the next phase of the ECHo experiment.

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