The mirrors of interferometric detectors of gravitational waves (GW) are suspended in order to be isolated from external disturbances. A local control system able to keep them correctly aligned and to damp the angular modes of the suspension is necessary. In this paper we present the solution adopted for Virgo based on a CCD camera sensor and on digital controls. With this solution the mirrors are kept aligned at the level of less than 1 murad rms, enough to lock the interferometer and start the automatic alignment system. (C) 2003 Elsevier B.V. All rights reserved.
A local control system for the test masses of the Virgo gravitational wave detector
GAMMAITONI, Luca;VOCCA, Helios;
2004
Abstract
The mirrors of interferometric detectors of gravitational waves (GW) are suspended in order to be isolated from external disturbances. A local control system able to keep them correctly aligned and to damp the angular modes of the suspension is necessary. In this paper we present the solution adopted for Virgo based on a CCD camera sensor and on digital controls. With this solution the mirrors are kept aligned at the level of less than 1 murad rms, enough to lock the interferometer and start the automatic alignment system. (C) 2003 Elsevier B.V. All rights reserved.File in questo prodotto:
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