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Regensburg 2010 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 2: SC: Applications and Measuring Devices

TT 2.2: Vortrag

Montag, 22. März 2010, 10:30–10:45, H19

Metallic magnetic calorimeters for high-resolution x-ray spectroscopy — •Jan-Patrick Porst, Sebastian Kempf, Andrea Kirsch, Andreas Pabinger, Christian Pies, Philipp Ranitzsch, Sönke Schäfer, Falk von Seggern, Loredana Gastaldo, Andreas Fleischmann, and Christian Enss — Kirchhoff-Institut für Physik, 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 change of magnetic flux in a dc-SQUID. During the last years we have started to develop MMCs for a wide variety of applications, ranging from beta- and gamma-spectrometry over the spatially resolved detection of accelerated molecule fragments to arrays of high resolution x-ray detectors. For x-ray energies up to 6 keV an energy resolution of 2.7 eV (FWHM) has been demonstrated and we expect that this can be pushed below 1 eV with the next generation of devices. We summarize the physics of MMCs and the presently used readout schemes as well as the typically observed noise contributions and their impact on the energy resolution. We discuss general design considerations, the micro-fabrication and the performance of micro-fabricated devices. In this field large progress has been achieved in the last years and the thermodynamic properties of most materials approach bulk values allowing for optimal and predictable performance.

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