Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 41: Focused Session: Cryogenic Detectors

TT 41.3: Topical Talk

Thursday, March 29, 2012, 16:15–16:40, H 2053

Magnetic calorimeters for x-ray and particle detection — •Andreas Fleischmann — Universität Heidelberg, INF 227, 69120 Heidelberg,

Metallic magnetic calorimeters (MMC) are calorimetric particle detectors, typically operated at temperatures below 100 mK, that make use of a paramagnetic temperature sensor to transform the temperature rise upon the absorption of a particle in the detector into a measurable magnetic flux change in a dc-SQUID. During the last years a growing number of groups has started to develop MMC for a wide variety of applications, ranging from alpha-, beta- and gamma-spectrometry over the spatially resolved detection of accelerated molecule fragments to arrays of high resolution x-ray detectors. For soft x-rays an energy resolution of 2.0 eV (FWHM) has been demonstrated and we expect that this can be pushed below 1 eV in near future. We give an introduction to the physics of MMCs including the typically observed noise contributions and their impact on the energy resolution. We discuss general design considerations, the micro-fabrication of MMCs and the performance of micro-fabricated devices for a couple of applications.