Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 31: Matter at Low Temperature: Materials
TT 31.1: Vortrag
Mittwoch, 25. März 2009, 15:45–16:00, HSZ 304
Modelling of the loss mechanisms in crystalline solids at low temperatures for future gravitational wave detectors — •Daniel Heinert1, Alexander Grib2, Christian Schwarz1, Stefanie Kroker1, Ronny Nawrodt3, Wolfgang Vodel1, Andreas Tünnermann4, Sheila Rowan3, Jim Hough3, and Paul Seidel1 — 1Friedrich-Schiller-Universität Jena, Institut für Festkörperphysik, Helmholtzweg 5, D-07743 Jena, Germany — 2Kharkov National University, Physics Department, 61077 Kharkov, Ukraine — 3University of Glasgow, Institute for Gravitational Research, Kelvinbuilding, University Avenue, G12 8QQ Glasgow, Scotland — 4Friedrich-Schiller-Universität Jena, Institut für Angewandte Physik, Albert-Einstein-Straße 15, D-07745 Jena, Germany
Mechanical losses play a crucial role in reducing thermal noise of future gravitational wave detectors. Low loss materials are needed at low temperatures to reduce thermal noise significantly.
We present a study of internal loss mechanisms in crystalline solids to understand the origin of dissipation. Exemplarily, the different loss contributions are described in crystalline quartz. The focus lies on thermoelastic losses and a contribution arising from the interaction of phonons. Then these results are applied to silicon as the most interesting material for the third generation of gravitational wave detectors.
This work is supported by the German science foundation DFG under contract SFB TR7.