The inertial damping of the VIRGO superattenuator and the residual motion of the mirror
2002; IOP Publishing; Volume: 19; Issue: 7 Linguagem: Inglês
10.1088/0264-9381/19/7/354
ISSN1361-6382
Autores Tópico(s)Pulsars and Gravitational Waves Research
ResumoThe 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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