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Improving the Robustness of the Advanced LIGO Detectors to Earthquakes

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arxiv 2007.12847 v1 pith:WRB3QRVE submitted 2020-07-25 physics.ins-det physics.app-phphysics.geo-ph

Eyal Schwartz , A Pele , J Warner , B Lantz , J Betzwieser , K L Dooley , S Biscans , M Coughlin
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N Mukund R Abbott C Adams R X Adhikari A Ananyeva S Appert K Arai J S Areeda Y Asali S M Aston C Austin A M Baer M Ball S W Ballmer S Banagiri D Barker L Barsotti J Bartlett B K Berger D Bhattacharjee G Billingsley C D Blair R M Blair N Bode P Booker R Bork A Bramley A F Brooks D D Brown A Buikema C Cahillane K C Cannon X Chen A A Ciobanu F Clara S J Cooper K R Corley S T Countryman P B Covas D C Coyne L E H Datrier D Davis C Di Fronzo J C Driggers P Dupej S E Dwyer A Effler T Etze M Evans T M Evans J Feicht A Fernandez-Galiana P Fritschel V V Frolov P Fulda M Fyffe J A Giaime K D Giardina P Godwin E Goetz S Gras C Gray R Gray A C Green Anchal Gupta E K Gustafson R Gustafson J Hanks J Hanson T Hardwick R K Hasskew M C Heintze A F Helmling-Cornell N A Holland J D Jones S Kandhasamy S Karki M Kasprzack K Kawabe N Kijbunchoo P J King J S Kissel Rahul Kumar M Landry B B Lane M Laxen Y K Lecoeuche J Leviton J Liu M Lormand A P Lundgren R Macas M MacInnis D M Macleod G L Mansell S M arka Z M arka D V Martynov K Mason T J Massinger F Matichard N Mavalvala1 R McCarthy D E McClelland S McCormick L McCuller J McIver T McRae G Mendell K Merfeld E L Merilh F Meylahn T Mistry R Mittleman G Moreno C M Mow-Lowry S Mozzon A Mullavey T J N Nelson P Nguyen L K Nuttall J Oberling Richard J Oram C Osthelder D J Ottaway H Overmier J R Palamos W Parker E Payne C J Perez M Pirello H Radkins K E Ramirez J W Richardson K Riles N A Robertson J G Rollins C L Romel J H Romie1 M P Ross K Ryan T Sadecki E J Sanchez L E Sanchez T R Saravanan R L Savage D Schaetzl R Schnabel R M S Schofield D Sellers T Shaffer D Sigg B J J Slagmolen J R Smith S Soni B Sorazu A P Spencer K A Strain L Sun M J Szczepanczyk M Thomas P Thomas K A Thorne K Toland C I Torrie G Traylor M Tse A L Urban G Vajente G Valdes D C Vander-Hyde P J Veitch K Venkateswara G Venugopalan A D Viets T Vo C Vorvick M Wade R L Ward B Weaver R Weiss C Whittle B Willke C C Wipf L Xiao H Yamamoto Hang Yu Haocun Yu L Zhang M E Zucker J Zweizig
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classification physics.ins-detphysics.app-phphysics.geo-ph
keywords earthquakesdetectorsadvancedligomotioncontrolduringground
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abstract

Teleseismic, or distant, earthquakes regularly disrupt the operation of ground--based gravitational wave detectors such as Advanced LIGO. Here, we present \emph{EQ mode}, a new global control scheme, consisting of an automated sequence of optimized control filters that reduces and coordinates the motion of the seismic isolation platforms during earthquakes. This, in turn, suppresses the differential motion of the interferometer arms with respect to one another, resulting in a reduction of DARM signal at frequencies below 100\,mHz. Our method greatly improved the interferometers' capability to remain operational during earthquakes, with ground velocities up to 3.9\,$\mu \mbox{m/s}$ rms in the beam direction, setting a new record for both detectors. This sets a milestone in seismic controls of the Advanced LIGO detectors' ability to manage high ground motion induced by earthquakes, opening a path for further robust operation in other extreme environmental conditions.

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    astro-ph.IM 2026-08 accept novelty 4.0 of 10

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