Improving the Robustness of the Advanced LIGO Detectors to Earthquakes

Authors

Eyal Schwartz
A. Pele
J. Warner
B. Lantz
Joseph Betzwieser
K. L. Dooley
S. Biscans
K. E. Ramirez, The University of Texas Rio Grande Valley

Document Type

Article

Publication Date

11-5-2020

Abstract

Teleseismic, or distant, earthquakes regularly disrupt the operation of ground–based gravitational wave detectors such as Advanced LIGO. Here, we present 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 μm s−1 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.

Comments

© 2020 IOP Publishing Ltd

Recommended Citation

Schwartz, E., A. Pele, J. Warner, B. Lantz, J. Betzwieser, K. L. Dooley, S. Biscans, et al. 2020. “Improving the Robustness of the Advanced LIGO Detectors to Earthquakes.” Classical and Quantum Gravity 37 (23): 235007. https://doi.org/10.1088/1361-6382/abbc8c.

Publication Title

Classical and Quantum Gravity

DOI

10.1088/1361-6382/abbc8c