DPG Phi
Verhandlungen
Verhandlungen
DPG

Berlin 2018 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 103: Superconductivity: Cryogenic Particle Detectors

TT 103.2: Vortrag

Donnerstag, 15. März 2018, 17:45–18:00, H 2053

Optimization of metallic magnetic calorimeter arrays with embedded 163Ho for the ECHo experiment — •Federica Mantegazzini and the ECHo collaboration — Kirchhoff-Institute for Physics, Heidelberg University, Germany.

The ECHo experiment aims to determine the electron neutrino mass via the analysis of the calorimetrically measured electron capture spectrum of 163Ho. The detector technology is based on metallic magnetic calorimeters (MMC) and the implantation of 163Ho has been selected as method to enclose the source in the detectors, showing already good performances for activity values up to 1 Bq. Since the sensitivity of the ECHo experiment strongly depends on the total acquired statistics, the activity per pixel needs to be increased, taking into account two constraints: the resulting unresolved pile-up events fraction and the supplementary heat capacity due to the implanted ions. We have developed a novel experimental technique for the determination of the specific heat per 163Ho ion, based on the simultaneous measurement of two MMC pixels with identical geometry which differ only because of the 163Ho ions implanted in one of the two. At an operational temperature of 20 mK for an activity of about 1 Bq, the heat capacity increases of less than 3%. Therefore, a total activity of the order of 10 Bq per pixel - as required in order to keep the unresolved pile-up fraction under control - can be implanted without strongly affecting the detector performance. In this contribution, the development and the characterisation of the new microfabricated detector arrays is presented.

100% | Mobil-Ansicht | English Version | Kontakt/Impressum/Datenschutz
DPG-Physik > DPG-Verhandlungen > 2018 > Berlin