Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 75: Neutrino physics without accelerators VI

T 75.2: Talk

Thursday, April 2, 2020, 16:50–17:05, H-HS XIII

Room Temperature and mK Characterisation of ECHo-100k MMC Array Chip — •Tom Wickenhäuser for the ECHo collaboration — Kirchhoff-Institute of Physics, Heidelberg University, Germany

The ECHo experiment is designed to determine the effective electron neutrino mass by the analysis of high resolution and high statistics ¹⁶³Ho electron capture spectra. The calorimetric measurement of the ¹⁶³Ho spectrum is performed using large arrays of low temperature metallic magnetic calorimeters (MMCs) hosting ¹⁶³Ho in the absorber and operated at mK temperature. For the ECHo-100k phase about 12000 detectors need to be operated. For a succesful integration of single array chips in the experiment we are developing a process to characterize the functionality of each detector without the need of measurements at mK temperatures. The idea is to find a correlation between resistance measurements of individual leads of a chip at room temperature and the performence at 4K and mK. The most important point is to ensure a reliable heat switching to insert a persistent current in the detector array. We discuss the result of the resistance measurements in correlation with the test performed at low temperatures and conclude with giving the reliability of the room temperature measurement for identifying working detectors.