Feedforward reduction of microseism disturbance in a long-based interometric gravitational-wave detector was discussed. Laser interferometer gravitational-wave observatory (LIGO) which has a 4 km base-line detectors was used. Results showed that the root mean-squared displacement near 0.15 Hz can be reduced by 10 dB

Abbott, R.

Adhikari, R.

Bork, R.

Daw, E. J.

Fritschel, P.

Giaime, J. A.

Heefner, J.

Weitz, M.

English

Crossref

Standing ocean waves driven by storms can excite surface waves in the ocean floor at twice the wave frequency. These traverse large distances on land and are called the double-frequency (DF) microseism. The Laser Interferometer Gravitational-wave Observatory (LIGO) detector relies on length servos to maintain optical resonance in its 4 km Fabry–Pérot cavities, which consist of seismically isolated in-vacuum suspended test mass mirrors in three different buildings. Correcting for the DF microseism motion can require tens of micrometers of actuation, a significant fraction of the feedback dynamic range. The LIGO seismic isolation design provides an external fine actuation system (FAS), which allows long-range displacement of the optical tables that support the test mass suspensions. We report on a feedforward control system that uses seismometer signals from each building to produce correction signals, which are applied to the FAS, largely removing the microseism disturbance independently of length control servos. The root-mean-squared displacement from the microseism near 0.15 Hz can be reduced by 10 dB on average

Adhikari, Rana X.

Caltech Authors - Main

Feedforward reduction of the microseism disturbance in a long-base-line interferometric gravitational-wave detector

Louisiana State University

https://authors.library.caltech.edu/91574/1/1.1524717.pdf

Feedforward reduction of the microseism disturbance in a long-base-line interferometric gravitational-wave detector

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Caltech Authors - Main

Louisiana State University