Seismic isolation and suspension systems for Advanced LIGO

Robertson, N. A.; Abbott, B. P.; Abbott, R.; Adhikari, R. X.; Allen, G.; Armandula, H.; Aston, S. M.; Baglino, A.; Barton, M. A.; Bland, B.; Bork, R.; Bogenstahl, J.; Cagnoli, G.; Campbell, Claire; Cantley, C. A.; Carter, K.; Cook, D.; Coyne, D. C.; Crooks, D. R. M.; Daw, E. J.; DeBra, D.; Elliffe, E. J.; Faludi, J; Fritschel, P.; Ganguli, Anurag; Giaime, J. A.; Goßler, S.; Grant, A.; Greenhalgh, J.; Hammond, M.; Hanson, J.; Hardham, C.; Harry, G. M.; Heptonstall, A.; Heefner, J.; Hough, J.; Hoyland, D.; Hua, W.; Jones, L.; Jones, R.; Kern, J.; LaCour, Jonathan; Lantz, B.; Lilienkamp, K.A.; Lockerbie, N. A.; Lück, H.; MacInnis, M.; Mailand, K.; Mason, K.; Mittleman, R.; Nayfeh, Samir A.; Nichol, Janet Elizabeth; Ottaway, D. J.; Overmier, H.; Perreur-Lloyd, M.; Phinney, J.; Plissi, M. V.; Rankin, W.D.; Robertson, D. I.; Romie, J. H.; Rowan, S.; Scheffler, R.; Shoemaker, D. H.; Sarin, P.; Sneddon, P.; Speake, C. C.; Spjeld, O.; Stapfer, G.; Strain, K. A.; Torrie, C. I.; Traylor, G.; Niekerk, Jan van; Vecchio, A.; Wen, S.; Willems, P. A.; Wilmut, Ian; Ward, H.; Zucker, M. E.; Lei, Zuo

doi:10.1117/12.552469

Cited by 22 publications

(15 citation statements)

References 13 publications

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“…These GW detectors are limited by different kinds of noise. In the low frequency band they are limited by seismic disturbances and suspension thermal noise [19]. At high frequencies the photon shot noise [20] sets a limit to the sensitivity of current GW detectors.…”

Section: Detectors and Optical Layoutmentioning

confidence: 99%

The Einstein Telescope

Kroker¹,

Nawrodt²

2014

2014 IEEE Metrology for Aerospace (MetroAeroSpace)

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Interferometric gravitational wave detectors are amongst the most sensitive instruments ever built. They are hunting for tiny oscillations in space-time originating from cosmic events such as inspiraling objects or supernova explosions. These detectors are based on Michelson-like interferometers reaching sensitivities for lengths changes of better than 10 −18 m/ √ Hz.Currently, a second generation of gravitational wave detectors is under construction reducing relevant noise sources throughout their detection band by one order of magnitude. First steps towards a third generation detector -having two orders of magnitude larger sensitivity compared to the first generation -have been made. This gravitational wave observatory -the Einstein Telescope -is a European-wide effort leading to a sophisticated design including an optimum site selection. We present the status of these activities and give an overview of the state of the art technologies needed to realize such an instrument.

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Section: Detectors and Optical Layoutmentioning

confidence: 99%

The Einstein Telescope

Kroker¹,

Nawrodt²

2014

2014 IEEE Metrology for Aerospace (MetroAeroSpace)

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“…(19) for 0, which yields to the solution given in Eq. (20). More details regarding these calculations can be found in [60].…”

Section: Blades and Flexuresmentioning

confidence: 99%

Seismic isolation of Advanced LIGO: Review of strategy, instrumentation and performance

Matichard

Lantz

Mittleman

et al. 2015

Class. Quantum Grav.

171

148

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The new generation of gravitational waves detectors require unprecedented levels of isolation from seismic noise. This article reviews the seismic isolation strategy and instrumentation developed for the Advanced LIGO observatories. It summarizes over a decade of research on active inertial isolation and shows the performance recently achieved at the Advanced LIGO observatories. The paper emphasizes the scientific and technical challenges of this endeavor and how they have been addressed. An overview of the isolation strategy is given. It combines multiple layers of passive and active inertial isolation to provide suitable rejection of seismic noise at all frequencies. A detailed presentation of the three active platforms that have been developed is given. They are the hydraulic pre-isolator, the single stage internal isolator and the two-stage internal isolator. The architecture, instrumentation, control scheme and isolation results are presented for each of the three systems. Results show that the seismic isolation sub-system meets Advanced LIGO stringent requirements and robustly supports the operation of the two detectors.

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“…Passive pendulum filters, often called suspensions, can be used both to isolate the components of a sensitive experiment from ground motion [21,22], and to build inertial sensors [23][24][25]. In this article, we investigate the use of suspensions to filter the transmission of tilt motion to horizontal inertial sensors [12].…”

Section: / (4)mentioning

confidence: 99%

“…This form can be used to approximate the tilt horizontal ratio of the suspended instrument ( ) at very low frequency as shown in Eq. (22). Both terms are related to the stiffness of the wire.…”

Section: Fig 4 Forces On the Suspended Platformmentioning

confidence: 99%

Modeling and experiment of the suspended seismometer concept for attenuating the contribution of tilt motion in horizontal measurements

Matichard

Evans

Mittleman

et al. 2016

Review of Scientific Instruments

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Tilt-horizontal coupling in inertial sensors limits the performance of active isolation systems such as those used in gravitational wave detectors. Inertial rotation sensors can be used to subtract the tilt component from the signal produced by horizontal inertial sensors, but such techniques are often limited by the sensor noise of the tilt measurement. A different approach is to mechanically filter the tilt transmitted to the horizontal inertial sensor, as discussed in this article. This technique does not require an auxiliary rotation sensor and can produce a lower noise measurement. The concept investigated uses a mechanical suspension to isolate the inertial sensor from input tilt. Modeling and simulations show that such a configuration can be used to adequately attenuate the tilt transmitted to the instrument, while maintaining translation sensitivity in the frequency band of interest. The analysis is supported by experimental results showing that this approach is a viable solution to overcome the tilt problem in the field of active inertial isolation.

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Seismic isolation and suspension systems for Advanced LIGO

Cited by 22 publications

References 13 publications

The Einstein Telescope

The Einstein Telescope

Seismic isolation of Advanced LIGO: Review of strategy, instrumentation and performance

Modeling and experiment of the suspended seismometer concept for attenuating the contribution of tilt motion in horizontal measurements

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