Brownian force noise from molecular collisions and the sensitivity of advanced gravitational wave observatories
Name
Dolesi-2011-Brownian force noise from molecular collisions.pdf
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569.79 KB
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Checksum (MD5)
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Author(s)
Weiss, Rainer
Dolesi, R.
Hueller, M.
Nicolodi, D.
Tombolato, D.
Vitale, S.
Wass, P. J.
Gundlach, J. H.
Hagedorn, C. A.
Schlamminger, S.
Date Issued
September 2011
Journal
Physical Review D
Publisher
American Physical Society (APS)
Citation
Dolesi, R. et al. “Brownian force noise from molecular collisions and the sensitivity of advanced gravitational wave observatories.” Physical Review D 84.6 (2011): n. pag. Web. 25 Jan. 2012. © 2011 American Physical Society
Version
Final published version
Abstract
We present an analysis of Brownian force noise from residual gas damping of reference test masses as a fundamental sensitivity limit in small force experiments. The resulting acceleration noise increases significantly when the distance of the test mass to the surrounding experimental apparatus is smaller than the dimension of the test mass itself. For the Advanced LIGO interferometric gravitational wave observatory, where the relevant test mass is a suspended 340 mm diameter cylindrical end mirror, the force noise power is increased by roughly a factor 40 by the presence of a similarly shaped reaction mass at a nominal separation of 5 mm. The force noise, of order 20 fN/Hz[superscript 1/2] for 2×10[superscript -6] Pa of residual H[subscript 2] gas, rivals quantum optical fluctuations as the dominant noise source between 10 and 30 Hz. We present here a numerical and analytical analysis for the gas damping force noise for Advanced LIGO, backed up by experimental evidence from several recent measurements. Finally, we discuss the impact of residual gas damping on the gravitational wave sensitivity and possible mitigation strategies.
Description
This article has been assigned LIGO document number p1100093.
MIT Department
Massachusetts Institute of Technology. Department of Physics
LIGO (Observatory : Massachusetts Institute of Technology)
MIT Kavli Institute for Astrophysics and Space Research
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.84.063007
