Regensburg 2007 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 30: Superconductivity - Cryodetectors
TT 30.6: Vortrag
Donnerstag, 29. März 2007, 18:15–18:30, H20
Investigation of the properties of tungsten thin films produced with the rf-sputtering technique — •Sabine Roth1, Christian Ciemniak1, Chiara Coppi1, Franz von Feilitzsch1, Achim Gütlein1, Christian Isaila1, Jean-Côme Lanfranchi1, Sebastian Pfister1, Walter Potzel1, Wolfgang Westphal1, Dieter Hauff2, Emilja Pantic2, Federica Petricca2, Franz Pröbst2, and Wolfgang Seidel2 — 1Physik-Department E15, Technische Universität München, James-Franck-Straße, D-85748 Garching — 2Max-Planck-Institut für Physik, Föhringer Ring 6, D-80805 München
The detection principle of the CRESST experiment (Cryogenic Rare Event Search with Superconducting Thermometers) is based on the ’phonon-light technique’, suppressing the background due to electron recoils by the simultaneous measurement of the phonons and the scintillation light generated in a CaWO4 crystal. For both channels cryogenic particle detectors based on Transition Edge Sensors (TESs) are employed. To ensure high sensitivity of the experiment, low working temperatures of the detectors are required. For this reason TESs consisting of tungsten thin films, with transition temperatures of about 10 mK, acting as the thermometers, are used. The manufacturing process of tungsten thin films with an rf-sputtering cathode in a vacuum facility will be discussed and characteristical properties of these films will be presented. This work has been supported by funds of the DFG (SFB 375, Transregio 27), the Cluster of Excellence (Origin and Structure of the Universe) and the Maier-Leibnitz-Laboratorium (Garching).