Improving the Robustness of the Advanced LIGO Detectors to Earthquakes
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\, 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.
Keywords
Cite
@article{arxiv.2007.12847,
title = {Improving the Robustness of the Advanced LIGO Detectors to Earthquakes},
author = {Eyal Schwartz and A Pele and J Warner and B Lantz and J Betzwieser and K L Dooley and S Biscans and M Coughlin and N Mukund and R Abbott and C Adams and R X Adhikari and A Ananyeva and S Appert and K Arai and J S Areeda and Y Asali and S M Aston and C Austin and A M Baer and M Ball and S W Ballmer and S Banagiri and D Barker and L Barsotti and J Bartlett and B K Berger and D Bhattacharjee and G Billingsley and C D Blair and R M Blair and N Bode and P Booker and R Bork and A Bramley and A F Brooks and D D Brown and A Buikema and C Cahillane and K C Cannon and X Chen and A A Ciobanu and F Clara and S J Cooper and K R Corley and S T Countryman and P B Covas and D C Coyne and L E H Datrier and D Davis and C Di Fronzo and J C Driggers and P Dupej and S E Dwyer and A Effler and T Etze and M Evans and T M Evans and J Feicht and A Fernandez-Galiana and P Fritschel and V V Frolov and P Fulda and M Fyffe and J A Giaime and K D Giardina and P Godwin and E Goetz and S Gras and C Gray and R Gray and A C Green and Anchal Gupta and E K Gustafson and R Gustafson and J Hanks and J Hanson and T Hardwick and R K Hasskew and M C Heintze and A F Helmling-Cornell and N A Holland and J D Jones and S Kandhasamy and S Karki and M Kasprzack and K Kawabe and N Kijbunchoo and P J King and J S Kissel and Rahul Kumar and M Landry and B B Lane and M Laxen and Y K Lecoeuche and J Leviton and J Liu and M Lormand and A P Lundgren and R Macas and M MacInnis and D M Macleod and G L Mansell and S M arka and Z M arka and D V Martynov and K Mason and T J Massinger and F Matichard and N Mavalvala1 and R McCarthy and D E McClelland and S McCormick and L McCuller and J McIver and T McRae and G Mendell and K Merfeld and E L Merilh and F Meylahn and T Mistry and R Mittleman and G Moreno and C M Mow-Lowry and S Mozzon and A Mullavey and T J N Nelson and P Nguyen and L K Nuttall and J Oberling and Richard J Oram and C Osthelder and D J Ottaway and H Overmier and J R Palamos and W Parker and E Payne and C J Perez and M Pirello and H Radkins and K E Ramirez and J W Richardson and K Riles and N A Robertson and J G Rollins and C L Romel and J H Romie1 and M P Ross and K Ryan and T Sadecki and E J Sanchez and L E Sanchez and T R Saravanan and R L Savage and D Schaetzl and R Schnabel and R M S Schofield and D Sellers and T Shaffer and D Sigg and B J J Slagmolen and J R Smith and S Soni and B Sorazu and A P Spencer and K A Strain and L Sun and M J Szczepanczyk and M Thomas and P Thomas and K A Thorne and K Toland and C I Torrie and G Traylor and M Tse and A L Urban and G Vajente and G Valdes and D C Vander-Hyde and P J Veitch and K Venkateswara and G Venugopalan and A D Viets and T Vo and C Vorvick and M Wade and R L Ward and B Weaver and R Weiss and C Whittle and B Willke and C C Wipf and L Xiao and H Yamamoto and Hang Yu and Haocun Yu and L Zhang and M E Zucker and J Zweizig},
journal= {arXiv preprint arXiv:2007.12847},
year = {2020}
}