Berlin 2005 – scientific programme

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TT: Tiefe Temperaturen

TT 28: Superconductivity - Applications I : Cryodetectors

TT 28.3: Talk

Tuesday, March 8, 2005, 14:45–15:00, TU H104

Development of metallic magnetic calorimeters for high-resolution X-ray spectroscopy — •M. Linck, A. Burck, T. Daniyarov, H. Rotzinger, T. Scarbrough, A. Fleischmann, and C. Enss — Kirchhoff-Institut für Physik, Heidelberg, Germany

X-ray detectors based on the concept of magnetic calorimetry are well suited for high-resolution spectroscopy. Metallic magnetic calorimeters (MMC) make use of a metallic paramagnetic temperature sensor, which is in tight thermal contact with a metallic X-ray absorber. The paramagnetic sensor is placed in a weak magnetic field; its magnetization is used to monitor the temperature. High-energy resolution can be obtained by using a low-noise, high-bandwidth DC SQUID system to measure the small change in magnetization upon the absorption of a X-ray.

We present the state of development of the current prototype detectors. We discuss noise contributions and the energy resolution observed in MMCs. Applications in material analysis and in metrology, such as absolute activity measurements of low-energy emitting radionuclides, will also be shown.