A calorimetric particle detector using a SQUID monitored transition edge thermometer

At the Technische Universitaet Muenchen and MPI Muenchen, we are studying calorimetric particle detectors utilizing absorber crystals and superconducting transition edge thermometry. High resolution results from the low absorber heat capacity and the strong temperature dependence of the resistance of the thermometer at the superconducting - normal phase transition. The thermometer signals are monitored with a SQUID, and subsequent pulse height analysis is performed. Detector performance is discussed relative to SQUID characteristics, and SQUID system slew rate limitations are specifically addressed. Prototype detector results are presented. (orig.)