Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 56: Neutrinophysik 4 (Doppelbetazerfall und Massen)

T 56.4: Vortrag

Dienstag, 28. März 2017, 17:35–17:50, VSH 118

Optimization of detector arrays and the cryogenic platform for the ECHo experiment — •Clemens Hassel for the ECHo collaboration — Kirchhoff-Institute for Physics, Heidelberg University, Germany.

The Electron Capture in ¹⁶³Ho experiment ECHo aims to probe the electron neutrino mass on a sub-eV level via the analysis of the calorimetrically measured high statistics electron capture spectrum of ¹⁶³Ho. For this, metallic magnetic calorimeter arrays (MMC) will be used, which are operated at millikelvin temperatures. The performance achieved by first prototypes of MMC detectors show that an energy resolution of Δ E_FWHM < 5 eV and a signal rise time of τ < 1 µ s can be reached. These values, obtained with single channel read out, fulfill the requirements for the first phase of ECHo, ECHo-1k. The challenge is to keep the same performance using the multiplexed read out. We present the current status of the new design for the detector arrays to be used in ECHo-1k. This array design allows for parallel read out as well as for multiplexed read out. We discuss results obtained during the first characterization of these detectors. The first phase of ECHo will be performed in a new dedicated cryostat. The future plans for mounting read out cables and the the design for the installation of the array on the experimental platform will be shown. Finally we discuss the present status of the ECHo-1k experimental set-up and present first results obtained with the new arrays operated in the new cryostat.