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Regensburg 2022 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 31: Superconducting Electronics and Cryogenics: Poster Session

TT 31.7: Poster

Thursday, September 8, 2022, 15:00–18:00, P1

From ECHo-1k to ECHo-100k: Optimisation of the High-Resolution Metallic Magnetic Calorimeters with Embedded 163Ho — •Markus Griedel1, Arnulf Barth1, Sebastian Berndt2,3, Lorenzo Calza1, Holger Dorrer3, Christoph Düllmann3,4,5, Christian Enss1, Andreas Fleischmann1, Daniel Hengstler1, Tom Kieck3,4,5, Nina Kneip2, Neven Kovac1, Federica Mantegazzini1, Andreas Reifenberger1, Alexander Karol Slawik1, Klaus Wendt2, and Loredana Gastaldo11Kirchhoff-Institute for Physics, Heidelberg University — 2Institute of Physics, Johannes Gutenberg University Mainz — 3Department of Chemistry - TRIGA Site, Johannes Gutenberg University Mainz — 4GSI Helmholtzzentrum für Schwerionenforschung GmbH — 5Helmholtz Institute Mainz

The ECHo collaboration aims to determine me) by analysing the 163Ho electron capture spectrum. Arrays of tens to hundreds of Metallic Magnetic Calorimeters (MMCs) implanted with 163Ho have been chosen because of their excellent energy resolution in the range of a few eV, their fast response time below 1   µ s and their good linearity. The MMC array enclosing 163Ho fabricated for the ECHo-1k phase has been fully characterised in terms of detector response, energy resolution and 163Ho activity. Based on these results a new 64-pixel-array design has been conceived for ECHo-100k, featuring an optimised single pixel geometry and allowing for a 163Ho activity of 10   Bq per pixel. First wafers, each with 40 ECHo-100k chips, have been fabricated and characterised. The obtained results show that the ECHo-100k array achieved the expected performance, especially an average energy resolution of 3.5   eV, fulfilling the requirements for the ECHo-100k phase.

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