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.