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Potential mechanical loss mechanisms in bulk materials for future gravitational wave detectors

: Heinert, D.; Grib, A.; Haughian, K.; Hough, J.; Kroker, S.; Murray, P.; Nawrodt, R.; Rowan, S.; Schwarz, C.; Seidel, P.; Tünnermann, A.

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Journal of physics. Conference series 228 (2010), No.1, Art. 012032, 7 pp.
ISSN: 1742-6588
ISSN: 1742-6596
Edoardo Amaldi Conference on Gravitational Waves <8, 2010, New York/NY>
Journal Article, Conference Paper, Electronic Publication
Fraunhofer IOF ()

Low mechanical loss materials are needed to further decrease thermal noise in upcoming gravitational wave detectors. We present an analysis of the contribution of Akhieser and thermoelastic damping on the experimental results of resonant mechanical loss measurements. The combination of both processes allows the fit of the experimental data of quartz in the low temperature region (10 K to 25 K). A fully anisotropic numerical calculation over a wide temperature range (10 K to 300 K) reveals, that thermoelastic damping is not a dominant noise source in bulk silicon samples. The anisotropic numerical calculation is sucessfully applied to the estimate of thermoelastic noise of an advanced LIGO sized silicon test mass.