The inertial damping of the VIRGO superattenuator and the residual motion of the mirror

Details The inertial damping of the VIRGO superattenuator and the residual motion of the mirror The inertial damping of the VIRGO superattenuator and the residual motion of the mirror

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002cqgra..19.1631l&link_type=abstract

Classical and Quantum Gravity, Volume 19, Issue 7, pp. 1631-1637 (2002).

Physics

6

Scientific paper

The VIRGO superattenuator (SA) is effective in suppressing seismic noise below the expected thermal noise level above 4 Hz. However, the residual mirror motion associated with the SA normal modes can saturate the interferometer control system. This motion is reduced by implementing a wideband (DC-5 Hz) multidimensional active control (the so-called inertial damping) which makes use of both accelerometers and position sensors and of a digital signal processing (DSP) system. Feedback forces are exerted by coil-magnet actuators on the top of an inverted pendulum pre-isolator stage. The residual root mean square motion of the mirror in 10 s is less than 0.1 μm.

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