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 Berndt^2,3, Lorenzo Calza¹, Holger Dorrer³, Christoph Düllmann^3,4,5, Christian Enss¹, Andreas Fleischmann¹, Daniel Hengstler¹, Tom Kieck^3,4,5, Nina Kneip², Neven Kovac¹, Federica Mantegazzini¹, Andreas Reifenberger¹, Alexander Karol Slawik¹, Klaus Wendt², and Loredana Gastaldo¹ — ¹Kirchhoff-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 m(ν_e) 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.