Berlin 2005 – scientific programme

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TT: Tiefe Temperaturen

TT 23: Posters Superconductivity, Solids at Low Temperature

TT 23.56: Poster

Monday, March 7, 2005, 14:00–18:00, Poster TU D

Metallic magnetic calorimeters: design considerations for large area detectors and arrays — •M. Linck, A. Burck, T. Daniyarov, H. Rotzinger, T. Scarbrough, A. Fleischmann, and C. Enss — Kirchhoff-Institut für Physik, Heidelberg, Germany

Metallic magnetic calorimetry is well suited for energy dispersive quantum detection. A metallic paramagnetic sensor, which is in tight thermal contact with a metallic absorber, is placed in a weak magnetic field. The sensor’s magnetization is used to monitor the temperature. Changes in magnetization upon the absorption of a quantum are measured by a low-noise, high-bandwidth DC SQUID system.

Design considerations have been made to find different geometries of metallic magnetic calorimters. Different shapes and sizes of a possible detector have been simulated, the energy resolution of such detectors has been calculated. It can be shown, that it is possible to increase the signal size and therefore the energy resolution by optimizing the geometry. We present the first results with a meander shaped geometry, which was also developed for large area detection. We discuss the energy resolution and show applications, such as the detection of molecule fragments, which require large detection areas.