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First Demonstration of Electrostatic Damping of Parametric Instability at Advanced LIGO

Blair, Carl and Abbott, Richard and Abbott, B. P. and Adhikari, R. X. and Anderson, S. B. and Ananyeva, A. and Appert, S. and Arai, K. and Billingsley, G. and Biscans, S and Bork, R. and Brooks, A. F. and Coyne, D. C. and Etzel, T. and Gushwa, K. E. and Gustafson, E. K. and Hall, E. D. and Heptonstall, A. W. and Korth, W. Z. and Maros, E. and Matichard, F. and McIntyre, G. and McIver, J. and Quintero, E. A. and Reitze, D. H. and Robertson, N. A. and Rollins, J. G. and Sanchez, E. J. and Taylor, R. and Torrie, C. I. and Vajente, G. and Wipf, C. C. and Yamamoto, H. and Zhang, L. and Zucker, M. E. and Zweizig, J. (2017) First Demonstration of Electrostatic Damping of Parametric Instability at Advanced LIGO. Physical Review Letters, 118 (15). Art. No. 151102. ISSN 0031-9007. doi:10.1103/PhysRevLett.118.151102.

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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 electrostatic actuation, with a resulting decay time constant of 23 sec. An average control force of 0.03 nN was required to maintain the acoustic mode at its minimum amplitude.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Adhikari, R. X.0000-0002-5731-5076
Arai, K.0000-0001-8916-8915
Billingsley, G.0000-0002-4141-2744
Biscans, S0000-0002-9635-7527
Brooks, A. F.0000-0003-4295-792X
Coyne, D. C.0000-0002-6427-3222
Hall, E. D.0000-0001-9018-666X
Korth, W. Z.0000-0003-3527-1348
McIver, J.0000-0003-0316-1355
Vajente, G.0000-0002-7656-6882
Zhang, L.0000-0002-0898-787X
Zucker, M. E.0000-0002-2544-1596
Zweizig, J.0000-0002-1521-3397
Additional Information:© 2017 American Physical Society. Received 28 November 2016; revised manuscript received 12 February 2017; published 11 April 2017. The authors acknowledge the entire LIGO Scientific Collaboration for their wide ranging expertise and contributions. LIGO was constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from the National Science Foundation, and it operates under Cooperative Agreement No. PHY-0757058. Advanced LIGO was built under Grant No. PHY-0823459. C. B. was supported by the Australian Research Council and the LSC fellows program.
Funding AgencyGrant Number
Australian Research CouncilUNSPECIFIED
Issue or Number:15
Record Number:CaltechAUTHORS:20170411-095535036
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76504
Deposited By: Tony Diaz
Deposited On:11 Apr 2017 17:10
Last Modified:15 Nov 2021 17:00

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