eprintid: 30250
rev_number: 15
eprint_status: archive
userid: 6034
dir: disk0/00/03/02/50
datestamp: 2021-07-27 13:06:21
lastmod: 2021-08-17 12:17:25
status_changed: 2021-07-27 13:06:21
type: doctoralThesis
metadata_visibility: show
creators_name: Mantegazzini, Federica
title: Development and characterisation of high-resolution metallic magnetic calorimeter arrays for the ECHo neutrino mass experiment
subjects: ddc-530
divisions: i-130700
adv_faculty: af-13
cterms_swd: Metallic magnetic calorimeters
cterms_swd: Neutrino
cterms_swd: Low temperature detectors
cterms_swd: Holmium
cterms_swd: ECHo experiment
abstract: This work is focused on the development of cryogenic metallic magnetic calorimeter detectors with implanted Ho-163 source for the ECHo (Electron Capture in Ho-163)experiment for the determination of the effective electron neutrino mass by studying the Ho-163 electron capture spectrum. The detector prototype fabricated for the first experimental phase, ECHo-1k, has been fully characterised, in terms of thermodynamic properties, detector response, energy resolution and Ho-163 activity per detector pixel. The specific heat per holmium ion in silver has been determined, comparing the response of detector pixels with and without implanted Ho-163. This accurate measurement indicates a lower value of the Ho-163 half-life with respect to the value reported in literature. Two implanted ECHo-1k detector chips have been operated in parallel in a dilution refrigerator which has been equipped with a 64-channel read-out chain. A high-statistics measurement with more than 10^8 Ho-163 electron capture events has been performed and the analysis of the resulting spectrum will allow to reach a sensitivity below 20 eV on the effective electron neutrino mass. Based on the outcomes of the ECHo-1k experimental phase, a novel detector design has been conceived in order to achieve the detector performance required for the succeeding experimental phase, ECHo-100k. The new ECHo-100k detector has been successfully fabricated and fully characterised, showing an improved detector response and an excellent energy resolution that reaches 3 eV FWHM, matching the designed value. The results obtained in this thesis set the starting point of the
ECHo-100k experiment.
date: 2021
id_scheme: DOI
id_number: 10.11588/heidok.00030250
ppn_swb: 1765589649
own_urn: urn:nbn:de:bsz:16-heidok-302501
date_accepted: 2021-07-07
advisor: HASH(0x55e0f7e7da98)
language: eng
bibsort: MANTEGAZZIDEVELOPMEN2021
full_text_status: public
place_of_pub: Heidelberg
citation:   Mantegazzini, Federica  (2021) Development and characterisation of high-resolution metallic magnetic calorimeter arrays for the ECHo neutrino mass experiment.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/30250/1/Dissertation_F_Mantegazzini.pdf