Study of three-mode parametric instability

Details Study of three-mode parametric instability Study of three-mode parametric instability

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jphcs.228a2025l&link_type=abstract

Journal of Physics: Conference Series, Volume 228, Issue 1, pp. 012025 (2010).

Physics

Scientific paper

The effect of parametric instability in advanced interferometric gravitational wave detectors is a potential problem for their proper operation. Great efforts have been made to study the onset of parametric instabilities and to find ways to control them. Here we present an experimental design for studying parametric instability in a 72 m cavity with suspended high quality fused silica mirrors. With 5 W input power and 20 kW circulation power inside the cavity, it is predicted that parametric instability will occur. The resonant condition of parametric instability can be met by thermally tuning the radius of curvature of a test mass. We will present simulation results of parametric gains for different radii of curvature of a test mass. The simulation results will provide the basis for designing the thermal tuning and observation parametric instability experiments. This will provide a test bed for studying parametric instability and its control for next generation detectors.

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