Frequency dependence of thermal noise in gram-scale cantilever flexures
Name
PhysRevD.92.112004.pdf
Size
1.07 MB
Format
Adobe PDF
Checksum (MD5)
1d621ef3754a1d7fd105fc0e6b791111
Author(s)
Nguyen, Thanh T-H.
Mow-Lowry, Conor Malcolm
Slagmolen, Bram J. J.
Miller, John
Mullavey, Adam J.
Altin, Paul A.
Shaddock, Daniel A.
McClelland, David E.
Gossler, Stefan
Date Issued
December 2015
Journal
Physical Review D
Publisher
American Physical Society
Citation
Nguyen, Thanh T-H., et al. "Frequency dependence of thermal noise in gram-scale cantilever flexures." Phys. Rev. D 92, 112004 (December 2015). © 2015 American Physical Society
Version
Final published version
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.
MIT Department
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.92.112004
