Control of the double pendulum optics suspension system of a 30 m triangular Fabry-Pérot cavity

M. Barsuglia (1) , François Bondu (1) , H. Heitmann (1) , P. Heusse (1) , C. N. Man (1) , L. Matone (1)

1 LAL - Laboratoire de l'Accélérateur Linéaire

We present a technique for the control of a double pendulum suspension system used to carry the optical elements of a 30 m long Fabry-Pérot cavity, a prototype for the mode cleaner of the VIRGO experiment. The movement of the payload is sensed with a charge coupled device camera, and the feedback forces are applied to the intermediate stage of the suspension via coil-magnet systems. The control strategy is explained and the application of the system for the longitudinal locking of the cavity is demonstrated.

Mots clés: Gravitational radiation detectors; mass spectrometers; and other instrumentation and techniques; Gravitational wave detectors and experiments; Servo and control equipment; robots; Interferometers; Lenses; prisms and mirrors; Mechanical instruments and equipment

Domaines: Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]; Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]

M. Barsuglia, François Bondu, H. Heitmann, P. Heusse, C. N. Man, et al.. Control of the double pendulum optics suspension system of a 30 m triangular Fabry-Pérot cavity. Review of Scientific Instruments, 2000, 71, pp.2890-2894. ⟨10.1063/1.1150708⟩. ⟨hal-00414588⟩