Damping parametric instabilities in future gravitational wave detectors by means of electrostatic actuators

Miller, John M.; Evans, M.; Barsotti, L.; Fritschel, P.; MacInnis, M.; Mittleman, R.; Shapiro, B.; Soto, J.; Torrie, C. I.

doi:10.1016/j.physleta.2010.12.032

Cited by 40 publications

(56 citation statements)

References 21 publications

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“…This Q factor is in the range expected given similar measurements of Advanced LIGO test masses [48,53], and the parametric gain is as predicted by Eq. (1) for a high, but far from maximal value of G n .…”

Section: Prl 114 161102 (2015) P H Y S I C a L R E V I E W L E T T Esupporting

confidence: 79%

“…In anticipation of PI, all Advanced LIGO test masses were outfitted with electrostatic actuators capable of damping mechanical modes (including the observed mode) associated with PI [48]. This method of damping TM mechanical modes has been demonstrated at MIT with a prototype Advanced LIGO optic, but has not yet been tested at LLO since the required feedback loop has not been implemented, and ROC changes were immediately available and decisively effective.…”

Section: Fig 4 (Color Online) the Amplitude Of The Excitation Shown Inmentioning

confidence: 99%

“…A wide variety of techniques have been suggested for overcoming parametric instabilities in gravitational wave detectors [43][44][45][46][47][48][49], most of which fall into a few notable categories: avoid instability by changing the radius of curvature of one or more optics [43,49], actively damp mechanical modes as they become excited [48], and prevent instability by increasing the loss of the test mass mechanical modes with passive dampers [35,45,46,50]. The first of these techniques has been demonstrated and found to be effective at LLO.…”

mentioning

confidence: 99%

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Observation of Parametric Instability in Advanced LIGO

Evans¹,

Gras²,

Fritschel³

et al. 2015

Phys. Rev. Lett.

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108

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Parametric instabilities have long been studied as a potentially limiting effect in high-power interferometric gravitational wave detectors. Until now, however, these instabilities have never been observed in a kilometer-scale interferometer. In this Letter, we describe the first observation of parametric instability in a gravitational wave detector, and the means by which it has been removed as a barrier to progress.

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Section: Prl 114 161102 (2015) P H Y S I C a L R E V I E W L E T T Esupporting

confidence: 79%

Section: Fig 4 (Color Online) the Amplitude Of The Excitation Shown Inmentioning

confidence: 99%

mentioning

confidence: 99%

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Observation of Parametric Instability in Advanced LIGO

Evans¹,

Gras²,

Fritschel³

et al. 2015

Phys. Rev. Lett.

Self Cite

108

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“…Three-mode interactions have been observed and studied extensively in long optical cavities. [4][5][6] As triply resonant devices, 3-mode optoacoustic parametric amplifiers can in principle have very high sensitivity to torsional motion, achieve strong optoacoustic coupling, and require less laser power than a 2-mode interaction, 3,7 where only 2 modes are resonant. For this reason, the 3-mode interaction reduces susceptibility to laser phase noise and amplitude noise.…”

Section: Introductionmentioning

confidence: 99%

High quality factor mg-scale silicon mechanical resonators for 3-mode optoacoustic parametric amplifiers

Torres

Meng

et al. 2013

Journal of Applied Physics

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A contour-mode film bulk acoustic resonator of high quality factor in a liquid environment for biosensing applications Appl. Phys. Lett. 96, 053703 (2010) Milligram-scale resonators have been shown to be suitable for the creation of 3-mode optoacoustic parametric amplifiers, based on a phenomena first predicted for advanced gravitational-wave detectors. To achieve practical optoacoustic parametric devices, high quality factor resonators are required. We present millimetre-scale silicon resonators designed to exhibit a torsional vibration mode with a frequency in the 10 5 -10 6 Hz range, for observation of 3-mode optoacoustic interactions in a compact table-top system. Our design incorporates an isolation stage and minimizes the acoustic loss from optical coating. We observe a quality factor of 7.5 Â 10 5 for a mode frequency of 401.5 kHz, at room temperature and pressure of 10 -3 Pa. We confirmed the mode shape by mapping the amplitude response across the resonator and comparing to finite element modelling. This study contributes to the development of 3-mode optoacoustic parametric amplifiers for use in novel high-sensitivity signal transducers and quantum measurement experiments. V C 2013 AIP Publishing LLC. [http://dx

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“…In the future, acoustic mode dampers attached to the test masses [13] could damp acoustic modes. Active damping [14] of acoustic modes can also suppress instabilities by applying feedback forces to the test masses.…”

mentioning

confidence: 99%

First Demonstration of Electrostatic Damping of Parametric Instability at Advanced LIGO

Blair¹,

Gras²,

Abbott³

et al. 2017

Phys. Rev. Lett.

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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.

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Damping parametric instabilities in future gravitational wave detectors by means of electrostatic actuators

Cited by 40 publications

References 21 publications

Observation of Parametric Instability in Advanced LIGO

Observation of Parametric Instability in Advanced LIGO

High quality factor mg-scale silicon mechanical resonators for 3-mode optoacoustic parametric amplifiers

First Demonstration of Electrostatic Damping of Parametric Instability at Advanced LIGO

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