Development of metallic magnetic calorimeter arrays with embedded $^{163}$Ho for the ECHo experiment

23 Jul 2019, 17:45
1h 15m
Piazza Città di Lombardia (Milano)

Piazza Città di Lombardia

Milano

Piazza Città di Lombardia, 1, 20124 Milano MI
Poster Low Temperature Detector fabrication techniques and materials Poster session

Speaker

Federica Mantegazzini (Kirchhoff Institute for Physics, Heidelberg University)

Description

The Electron Capture in $^{163}$Ho (ECHo) collaboration plans to reach sub-eV sensitivity level on the effective electron neutrino mass by the analysis of a high energy resolution and high statistics electron capture spectrum of $^{163}$Ho. Large arrays, of the order of 100 pixels each, of metallic magnetic calorimeters (MMCs) with enclosed $^{163}$Ho, read out utilizing microwave SQUID multiplexing, have been selected to achieve this goal. With first prototypes of MMCs having $^{163}$Ho ions implanted in their absorbers and operated at about 15 mK, energy resolutions $\Delta E_{\mathrm{FWHM}}$ below 5 eV were achieved. . We show results obtained in the characterization of an MMC array in terms of activity, energy resolution and intrinsic background of single pixels. We present the design of next generation MMC arrays for the ECHo experiment and discuss the processes to reliably embed high purity $^{163}$Ho source in detector absorbers. . In conclusion, we discuss how the production of MMC arrays, including micro-fabrication and 163Ho enclosing, can be scaled up to cope for the requirement of the up-coming phases of the ECHo experiment.

Less than 5 years of experience since completion of Ph.D N
Student (Ph.D., M.Sc. or B.Sc.) Y

Primary author

Federica Mantegazzini (Kirchhoff Institute for Physics, Heidelberg University)

Co-authors

Arnulf Barth (Kirchhoff Institute for Physics, Heidelberg University) Holger Dorrer (Johannes Gutenberg-Universität, Mainz) Christoph E. Düllmann (Johannes Gutenberg-Universität, Mainz) Christian Enss (Kirchhoff Institute for Physics, Heidelberg University) Andreas Fleischmann (Kirchhoff Institute for Physics, Heidelberg University) Loredana Gastaldo (Kirchhoff Institute for Physics, Heidelberg University) Sebastian Kempf (Kirchhoff Institute for Physics, Heidelberg University) Tom Kieck (Johannes Gutenberg-Universität, Mainz) Nina Kneip (Johannes Gutenberg-Universität, Mainz) Ulli Köster (Institute Laue-Langevin, Grenoble) Andreas Reifenberger (Kirchhoff Institute for Physics, Heidelberg University) Clemens Velte (Kirchhoff Institute for Physics, Heidelberg University) Mathias Wegner (Kirchhoff Institute for Physics, Heidelberg University) Klaus Wendt (Johannes Gutenberg-Universität, Mainz)

Presentation Materials