First demonstration of electrostatic damping of parametric instability at advanced LIGO

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Blair, Carl and Lockerbie, N.A., LSC Instrument Authors (2017) First demonstration of electrostatic damping of parametric instability at advanced LIGO. Physical Review Letters, 118 (15). 151102. ISSN 1079-7114 (https://doi.org/10.1103/PhysRevLett.118.151102)

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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.

ORCID iDs

Blair, Carl and Lockerbie, N.A. ORCID logoORCID: https://orcid.org/0000-0002-1678-3260;
  • Item type:Article
    ID code:60958
    Dates:
    Date
    Event
    14 April 2017
    Published
    12 February 2017
    Accepted
    Notes:Please consult manuscript for full attribution details.
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:15 Jun 2017 10:53
    Last modified:11 Nov 2024 11:43
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/60958
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