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Control strategy to limit duty cycle impact of earthquakes on the LIGO gravitational-wave detectors

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arxiv 1707.03466 v1 pith:G3YFPA3R submitted 2017-07-11 physics.ins-det

S. Biscans , J. Warner , R. Mittleman , C. Buchanan , M. Coughlin , M. Evans , H. Gabbard , J. Harms
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B. Lantz N. Mukund A. Pele C. Pezerat P. Picart H. Radkins T. Shaffer
This is my paper · ORCID
classification physics.ins-det
keywords ligodetectorsearthquakesgravitational-wavesystemcontrolearly-warningearthquake
verification ladder T0 review T1 audit T2 compute T3 formal
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Advanced gravitational-wave detectors such as the Laser Interferometer Gravitational-Wave Observatories (LIGO) require an unprecedented level of isolation from the ground. When in operation, they are expected to observe changes in the space-time continuum of less than one thousandth of the diameter of a proton. Strong teleseismic events like earthquakes disrupt the proper functioning of the detectors, and result in a loss of data until the detectors can be returned to their operating states. An earthquake early-warning system, as well as a prediction model have been developed to help understand the impact of earthquakes on LIGO. This paper describes a control strategy to use this early-warning system to reduce the LIGO downtime by 30%. It also presents a plan to implement this new earthquake configuration in the LIGO automation system.

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