Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 24: Superconductivity: Cryodetectors

TT 24.5: Vortrag

Mittwoch, 29. März 2006, 17:45–18:00, HSZ 02

Metallic Magnetic Calorimeters (MMC) for high-resolution spectroscopy of x-ray quanta and energetic particles — •Andreas Burck, Markus Linck, Hannes Rotzinger, Tim Scarbrough, Andreas Fleischmann, and Christian Enss — Kirchhoff-Institut für Physik, Heidelberg, Germany

Metallic magnetic calorimeters (MMC) are non-dispersive low temperature particle detectors. They combine the high spectral resolution of dispersive spectrometer and the high efficiency of solid state spectrometer. Their calorimetric detection principle allows for a variety of absorber materials and detector geometries. Metallic magnetic calorimeters consist of an absorber and a metallic paramagnetic temperature sensor which is situated in a weak magnetic field. The deposition of energy in the absorber causes a rise in temperature and results in a change of magnetization of the paramagnetic sensor which is measured by using a low-noise high-bandwidth dc-SQUID. We present the state of development of the current prototype detectors. The observed noise contributions and the energy resolution in MMC‘s will be discussed. Furthermore the results achieved with prototype detectors for some applications such as high resolution spectroscopy and absolute activity measurements of low-energy emitting radionuclides in metrology will be shown.