Frequency dependence of thermal noise in gram-scale cantilever flexures
Date
2015
Authors
Nguyen, Thanh
Mow-Lowry, Conor M
Slagmolen, Bram
Miller, John
Mullavey, Adam
Gossler, S
Altin, Paul
Shaddock, Daniel
McClelland, David
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Volume Title
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American Physical Society
Abstract
We present measurements of the frequency dependence of thermal noise in aluminum and niobium flexures. Our measurements cover the audio-frequency band from 10 Hz to 10 kHz, which is of particular relevance to ground-based interferometric gravitational wave detectors, and span up to an order of magnitude above and below the fundamental flexure resonances. Results from two flexures are well explained by a simple model in which both structural and thermoelastic loss play a role. The ability of such
a model to explain this interplay is important for investigations of quantum-radiation-pressure noise and the standard quantum limit. Furthermore, measurements on a third flexure provide evidence that surface damage can affect the frequency dependence of thermal noise in addition to reducing the quality factor, a
result which will aid the understanding of how aging effects impact on thermal noise behavior.
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Source
Physical Review D-Particles, Fields, Gravitation and Cosmology
Type
Journal article
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Access Statement
Open Access