First locking of the Virgo central area interferometer with suspension hierarchical control

Details First locking of the Virgo central area interferometer with suspension hierarchical control First locking of the Virgo central area interferometer with suspension hierarchical control

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aph....20..629a&link_type=abstract

Astroparticle Physics, Volume 20, Issue 6, p. 629-640.

Physics

9

Gravitational Wave Detectors And Experiments, Interferometers, Control Systems, Servo And Control Equipment, Robots, Vibration Isolation

Scientific paper

Operation of the central portion of Virgo as a simple 6 m Michelson interferometer has given the first demonstration of the possibility to control an interferometer suspended from Virgo full scale multistage seismic attenuators using information derived from the interferometer locking signal. A special role in the control is played by the first stage of these suspensions, an inverted pendulum: besides its seismic preisolation action, this stage has positioning dynamics of several mm, and it allows to exert a very low frequency control at the upper level of the suspension using the interferometer fringe signal. The application of this feedback to the top-stage of the suspension allows corrections of drifts, such as tidal ones, at a stage of the suspension where a large dynamic range in displacements is available, without introducing noise at the level of the mirror, resulting in a significant reduction of the lock keeping force applied directly on the mirror at the lowest stage of the attenuator.

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