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  First Demonstration of Electrostatic Damping of Parametric Instability at Advanced LIGO

Blair, C., Gras, S., Abbott, R., Aston, S., Betzwieser, J., Blair, D., et al. (2017). First Demonstration of Electrostatic Damping of Parametric Instability at Advanced LIGO. Physical Review Letters, 118: 151102. doi:10.1103/PhysRevLett.118.151102.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-4918-5 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-106A-5
Genre: Journal Article

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1611.08997.pdf (Preprint), 520KB
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 Creators:
Blair, Carl, Author
Gras, Slawek, Author
Abbott, Richard, Author
Aston, Stuart, Author
Betzwieser, Joseph, Author
Blair, David, Author
DeRosa, Ryan, Author
Evans, Matthew, Author
Frolov, Valera, Author
Fritschel, Peter, Author
Grote, Hartmut1, Author              
Hardwick, Terra, Author
Liu, Jian, Author
Lormand, Marc, Author
Miller, John, Author
Mullavey, Adam, Author
O'Reilly, Brian, Author
Zhao, Chunnong, Author
Authors, LSC Instrument, Author
Affiliations:
1Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, escidoc:24010              

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Free keywords: Physics, Instrumentation and Detectors, physics.ins-det, Astrophysics, Instrumentation and Methods for Astrophysics, astro-ph.IM, Physics, Optics, physics.optics
 Abstract: Interferometric gravitational wave detectors operate with high optical power in their arms in order to achieve high shot-noise limited strain sensitivity. A significant limitation to increasing the optical power is the phenomenon of three-mode parametric instabilities, in which the laser field in the arm cavities is scattered into higher order optical modes by acoustic modes of the cavity mirrors. The optical modes can further drive the acoustic modes via radiation pressure, potentially producing an exponential buildup. One proposed technique to stabilize parametric instability is active damping of acoustic modes. We report here the first demonstration of damping a parametrically unstable mode using active feedback forces on the cavity mirror. A 15,538 Hz mode that grew exponentially with a time constant of 182 sec was damped using electro-static actuation, with a resulting decay time constant of 23 sec. An average control force of 0.03 nNrms was required to maintain the acoustic mode at its minimum amplitude.

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 Dates: 2016-11-282017
 Publication Status: Published in print
 Pages: 6 pages, 5 figures
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 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1611.08997
DOI: 10.1103/PhysRevLett.118.151102
URI: http://arxiv.org/abs/1611.08997
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 118 Sequence Number: 151102 Start / End Page: - Identifier: ISSN: 0031-9007
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/954925433406_1