Computer Science
Scientific paper
Mar 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cqgra..21s.951b&link_type=abstract
Classical and Quantum Gravity, Volume 21, Issue 5, pp. S951-S958 (2004).
Computer Science
3
Scientific paper
Two very low frequency pre-isolation stages can greatly reduce the residual motion of suspended optical components. In a mode cleaner this can reduce the control forces required on the mirrors, simplifying lock acquisition and reducing noise injection through control forces. This paper describes a 12 m triangular suspended mode cleaner under construction for the AIGO high optical power interferometer. A novel and very compact multistage isolator supports the cavity mirrors. It combines an inverse pendulum in series with a low-mass Roberts linkage, both with pendulum frequencies below 0.1 Hz. The suspension chain is connected to the Roberts linkage via a Euler spring stage and a cantilever spring assembly for vertical isolation. We present an analysis of the mode cleaner, emphasizing the advantage of the improved mode-cleaner suspension and its power-handling capability. The effect of seismic noise on the residual velocity of the mirrors and the predicted frequency stability of the optical cavity are presented.
Barriga Pablo
Blair David Gerald
Woolley Andrew
Zhao Chunnong
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