@article{a7602c6bdb224eda8cf8b3245506690c,
title = "First Demonstration of Electrostatic Damping of Parametric Instability at Advanced LIGO",
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 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.",
author = "{(LSC Instrument Authors)} and Carl Blair and Slawek Gras and Richard Abbott and Stuart Aston and Joseph Betzwieser and David Blair and Ryan Derosa and Matthew Evans and Valera Frolov and Peter Fritschel and Hartmut Grote and Terra Hardwick and Jian Liu and Marc Lormand and John Miller and Adam Mullavey and Brian O'Reilly and Chunnong Zhao and Abbott, {B. P.} and Abbott, {T. D.} and C. Adams and Adhikari, {R. X.} and Anderson, {S. B.} and A. Ananyeva and S. Appert and K. Arai and Ballmer, {S. W.} and D. Barker and B. Barr and L. Barsotti and J. Bartlett and I. Bartos and Batch, {J. C.} and Bell, {A. S.} and G. Billingsley and J. Birch and S. Biscans and C. Biwer and R. Bork and Brooks, {A. F.} and G. Ciani and F. Clara and Countryman, {S. T.} and Cowart, {M. J.} and Coyne, {D. C.} and A. Cumming and L. Cunningham and K. Danzmann and {Da Silva Costa}, {C. F.} and Daw, {E. J.}",
note = "Funding Information: 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. Publisher Copyright: {\textcopyright} 2017 American Physical Society.",
year = "2017",
month = apr,
day = "11",
doi = "10.1103/PhysRevLett.118.151102",
language = "English (US)",
volume = "118",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "15",
}