Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 24: Superconductivity: Cryodetectors
TT 24.4: Vortrag
Mittwoch, 29. März 2006, 17:30–17:45, HSZ 02
Cryogenic light detectors with Neganov-Luke amplification — •Christian Isaila1, Oliver Boslau2, Chiara Coppi1, Franz von Feilitzsch1, Peter Goldstraß2, Josef Kemmer2, Jean-Come Lanfranchi1, Andreas Pahlke2, Sebastian Pfister1, Walter Potzel1, Wolfgang Rau1, Michael Stark1, Doreen Wernicke3, Wolfgang Westphal1, and Florian Wiest2 — 1Technische Universität München, Physik Department E15, James-Franck Str., 85748 Garching — 2Ketek GmbH, Gustav Heinemann Ring 125, 81739 München — 3VeriCold Technologies GmbH, Bahnhofstr. 21, 85737 Ismaning
CRESST (Cryogenic Rare Event Search with Superconducting Thermometers) searches for nuclear recoils induced by particle dark matter. For an active suppression of the background due to electron recoils both phonons and scintillation light generated in a CaWO4 crystal are detected simultaneously. While the phonon signal is read out by a transition edge sensor (TES) on the CaWO4 crystal, the scintillation light is measured by a cryogenic light detector consisting of a silicon absorber equipped with a TES. As only a small fraction (about 1%) of the energy of the incident particles is transferred into light, very sensitive light detectors are needed. The threshold of the light detectors can be improved by applying an electric field to the silicon crystal leading to an amplification of the thermal signal due to the Neganov-Luke effect. Measurements with an applied Neganov-Luke voltage will be presented.