First Demonstration of Electrostatic Damping of Parametric Instability at Advanced LIGO.
Carl Blair, Slawek Gras, Richard Abbott, Stuart Aston, Joseph Betzwieser, David Blair, Ryan DeRosa, Matthew Evans, Valera Frolov, Peter Fritschel, Hartmut Grote, Terra Hardwick, Jian Liu, Marc Lormand, John Miller, Adam Mullavey, Brian O'Reilly, Chunnong Zhao, B P Abbott, T D Abbott, C Adams, R X Adhikari, S B Anderson, A Ananyeva, S Appert, K Arai, S W Ballmer, D Barker, B Barr, L Barsotti, J Bartlett, I Bartos, J C Batch, A S Bell, G Billingsley, J Birch, S Biscans, C Biwer, R Bork, A F Brooks, G Ciani, F Clara, S T Countryman, M J Cowart, D C Coyne, A Cumming, L Cunningham, K Danzmann, C F Da Silva Costa, E J Daw, D DeBra, R DeSalvo, K L Dooley, S Doravari, J C Driggers, S E Dwyer, A Effler, T Etzel, T M Evans, M Factourovich, H Fair, A Fernández Galiana, R P Fisher, P Fulda, M Fyffe, J A Giaime, K D Giardina, E Goetz, R Goetz, C Gray, K E Gushwa, E K Gustafson, R Gustafson, E D Hall, G Hammond, J Hanks, J Hanson, G M Harry, M C Heintze, A W Heptonstall, J Hough, K Izumi, R Jones, S Kandhasamy, S Karki, M Kasprzack, S Kaufer, K Kawabe, N Kijbunchoo, E J King, P J King, J S Kissel, W Z Korth, G Kuehn, M Landry, B Lantz, N A Lockerbie, A P Lundgren, M MacInnis, D M Macleod, S Márka, Z Márka, A S Markosyan, E Maros, I W Martin, D V Martynov, K Mason, T J Massinger, F Matichard, N Mavalvala, R McCarthy, D E McClelland, S McCormick, G McIntyre, J McIver, G Mendell, E L Merilh, P M Meyers, R Mittleman, G Moreno, G Mueller, J Munch, L K Nuttall, J Oberling, P Oppermann, Richard J Oram, D J Ottaway, H Overmier, J R Palamos, H R Paris, W Parker, A Pele, S Penn, M Phelps, V Pierro, I Pinto, M Principe, L G Prokhorov, O Puncken, V Quetschke, E A Quintero, F J Raab, H Radkins, P Raffai, S Reid, D H Reitze, N A Robertson, J G Rollins, V J Roma, J H Romie, S Rowan, K Ryan, T Sadecki, E J Sanchez, V Sandberg, R L Savage, R M S Schofield, D Sellers, D A Shaddock, T J Shaffer, B Shapiro, P Shawhan, D H Shoemaker, D Sigg, B J J Slagmolen, B Smith, J R Smith, B Sorazu, A Staley, K A Strain, D B Tanner, R Taylor, M Thomas, P Thomas, K A Thorne, E Thrane, C I Torrie, G Traylor, G Vajente, G Valdes, A A van Veggel, A Vecchio, P J Veitch, K Venkateswara, T Vo, C Vorvick, M Walker, R L Ward, J Warner, B Weaver, R Weiss, P Weßels, B Willke, C C Wipf, J Worden, G Wu, H Yamamoto, C C Yancey, Hang Yu, Haocun Yu, L Zhang, M E Zucker, J Zweizig
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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