High-resolution metallic magnetic calorimeters for β-spectroscopy [beta-spectroscopy] on _1hn1_1hn8_1hn7Rhenium and position resolved X-ray spectroscopy [Elektronische Ressource] / presented by Jan-Patrick Porst

Dissertationsubmitted to theCombined Faculties of the Natural Sciences and Mathematicsof the Ruperto-Carola-University of Heidelberg, Germanyfor the degree ofDoctor of Natural Sciencespresented byDipl.-Phys. Jan-Patrick Porstborn in PretoriastOral examination: February 1 , 2011High-Resolution Metallic Magnetic Calorimetersfor187β-Spectroscopy on RheniumandPosition Resolved X-Ray SpectroscopyReferees:Prof. Dr. C. EnssProf. Dr. K. BlaumThis thesis describes the development of metallic magnetic calorimeters (MMCs) for high reso-lution spectroscopy. MMCs are energy dispersive particle detectors based on the calorimetricprinciple which are typically operated at temperatures below 100mK. The detectors make useof a paramagnetic temperature sensor to transform the temperature rise upon the absorptionof a particle in the detector into a measurable magnetic flux change in a dc-SQUID.The application of MMCs for neutrino mass measurements and their advantages with respectto other approaches are discussed. In view of this application the development of an MMC187optimized for β-endpoint spectroscopy on rhenium is presented. A fully micro-fabricated X-raydetectorischaracterizedandperformsclosetodesignvalues.Furthermore,anewtechniqueto more efficiently couple rhenium absorbers mechanically and thermally to the sensor wasdeveloped and successfully tested.