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Progress on low-frequency active vibration isolation

Published

Author(s)

S J. Richman

Abstract

The gravity group at JILA is constructing a three-stage active isolation system to demonstrate useful reduction of low-frequency seismic noise for a gravitational wave interferometer. The control loops on the first two stages are now fully functional in all six rigid-body degrees-of-freedom. Measurements of the responce of the system to large input signals have shown an isolation factor of 3x103 in both vertical and horizontal directions at frequencies of 1 Hz and above. With the most important control system problems solved, we have turned out attention to noise reduction. The first main stage seismometers have been instumented with high-sensitivity readouts. These are single-bounce Michelson interferometers using corner cubes, each illuminated with 1.3 υm light delivered via optical fiber from a quiet Nd:YAG laser. The interfoerometers should allow a shot noise-limited seismometer performance of 3x10-15m/Hz.
Citation
Marcel Grossmann Meeting on General Relativity

Keywords

gravitational waves, LIGO, seismic isolation, seisometers

Citation

Richman, S. (2008), Progress on low-frequency active vibration isolation, Marcel Grossmann Meeting on General Relativity (Accessed April 14, 2024)
Created October 16, 2008