Abstract
The VIRGO gravitational wave detector uses several optical benches suspended inside a large vacuum system. One of these benches is placed at the interferometer output port and it includes all of the optics required to collect and filter the interferometer dark fringe beam. The position of this bench is controlled with respect to ground by means of a charge coupled device camera and 400 light-emitting diodes placed outside the vacuum tank. The read-out sensitivity is a few 10−8 m/√Hz for the translations degrees of freedom and 10−7 rad/√Hz for the rotational degrees of freedom. Displacements as large as ±10 mm and rotations at the level of ±5 mrad can be measured. The feedback is based on a digital architecture and it has been fully tested at the VIRGO site. It is able to control all the six degrees of freedom of the bench with a precision better than 1 μm for the translations and 0.5 μrad for all the rotations.
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