Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session

TT 33.67: Poster

Wednesday, March 28, 2012, 15:00–19:00, Poster B

Low temperature particle detectors with magnetic penetration thermometers — •N. Foerster, D. Hengstler, A. Kampkötter, S. Kempf, C. Pies, G. Pizzigoni, P. Ranitzsch, S. Schäfer, S. Uhl, L. Gastaldo, A. Fleischmann, and C. Enss — Kirchhoff-Institut für Physik, INF 227, 69120 Heidelberg

We present low temperature micro-calorimeters based on a novel sensor concept, the Magnetic Penetration Thermometers (MPTs). The MPTs make use of the temperature dependence of the critical magnetic field and the penetration depth of a superconducting sensor. The superconducting sensor is inductively coupled to a superconducting pick-up coil which also provides a bias magnetic field. The flux in the pick-up coil depends on the position of the interface between normal and superconducting regions in the sensor which in turn is a steep function of temperature. The change of magnetic flux upon the absorption of a particle is read-out by low-noise high-bandwidth dc-SQUIDs. Similar to metallic magnetic calorimeters, MPTs operate in a wide range of temperature and without intrinsic bias power dissipation.

We present the results of numerical simulations for the signal size and energy resolution for various superconducting films based on a simple thermo-dynamical model, as well as first experimental results.