Regensburg 2007 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 30: Superconductivity - Cryodetectors
TT 30.5: Talk
Thursday, March 29, 2007, 18:00–18:15, H20
Cryogenic light detectors with Neganov-Luke amplification — •Christian Isaila1, Oliver Boslau2, Christian Ciemniak1, Chiara Coppi1, Franz von Feilitzsch1, Achim Gütlein1, Josef Kemmer2, Jean-Côme Lanfranchi1, Andreas Pahlke2, Sebastian Pfister1, Walter Potzel1, Wolfgang Rau1, Sabine Roth1, Michael Stark1, Wolfgang Westphal1, and Florian Wiest2 — 1Technische Universität München, Physik Department E15, James-Franck Str., 85748 Garching — 2Ketek GmbH, Hofer Strasse 3, 81737 München
For an active suppression of the background due to electron recoils in the CRESST experiment both phonons and scintillation light generated in a CaWO4 crystal are detected simultaneously using cryogenic detectors based on transition edge sensors (TES). As only a small fraction (about 1%) of the energy deposited in the crystal is detected as light, very sensitive light detectors are needed. Following Neganov and Luke, the threshold of the light detector can be improved by drifting the electron-hole pairs generated by the scintillation photons in an electric field. Thus additional phonons are created leading to an amplification of the signal. For an efficient charge collection Si substrates with low trap densities are required. For this purpose and for electrical decoupling, the TES is glued onto the Si substrate. Results from measurements with Neganov-Luke amplification using glued TES 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).