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First locking of the Virgo central area interferometer with suspension hierarchical control |
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| Institution: | a INFN––sez.Napoli and/or Università di Napoli “Federico II” Complesso Universitario di Monte S. Angelo Via Cintia, I-80126 Napoli, Italia and/or Università di Salerno Via Ponte Don Melillo, I-84084, Fisciano (Salerno), Italy b INFN Sezione di Perugia and/or Università di Perugia, Via A. Pascoli, I-06123, Perugia, Italy c Laboratoire de l’Accélérateur Linéaire (LAL), IN2P3/CNRS-Université de Paris-Sud, B.P. 34, 91898, Orsay Cedex, France d INFN, Laboratori Nazionali di Frascati Via E. Fermi, 40, I-00044, Frascati (Roma), Italy e European Gravitational Observatory (EGO), Via E. Amaldi, I-56021, Cascina (PI), Italy f INFN––Sezione di Pisa and/or Università di Pisa, Via Filippo Buonarroti, 2 I-56127, PISA, Italy g Laboratoire d’Annecy-le-Vieux de physique des particules Chemin de Bellevue––BP 110, 74941, Annecy-le-Vieux Cedex, France h ESPCI––10, rue Vauquelin, 75005, Paris, France i Observatoire de la Côte d’Azur––Département Fresnel Interférométrie Laser pour la Gravitation et l’Astrophysique BP 4229, 06304, Nice Cedex 4, France j INFN––Sez. Firenze/Urbino Via G.Sansone 1, I-50019 Sesto Fiorentino and/or Università di Firenze, and/or Osservatorio Astrofisico di Arcetri Largo E. Fermi 5, I-50125 Firenze and/or Università di Urbino, Via S.Chiara, 27 I-61029, Urbino, Italy k INFN, Sezione di Roma and/or Università “La Sapienza”, P.le A. Moro 2, I-00185, Roma, Italy l SMA––IPNL 22, Boulevard Niels Bohr 69622, Villeurbanne-Lyon Cedex, France |
| Abstract: | Operation of the central portion of Virgo as a simple 6 m Michelson interferometer has given the first demonstration of the possibility to control an interferometer suspended from Virgo full scale multistage seismic attenuators using information derived from the interferometer locking signal. A special role in the control is played by the first stage of these suspensions, an inverted pendulum: besides its seismic preisolation action, this stage has positioning dynamics of several mm, and it allows to exert a very low frequency control at the upper level of the suspension using the interferometer fringe signal. The application of this feedback to the top-stage of the suspension allows corrections of drifts, such as tidal ones, at a stage of the suspension where a large dynamic range in displacements is available, without introducing noise at the level of the mirror, resulting in a significant reduction of the lock keeping force applied directly on the mirror at the lowest stage of the attenuator. |
| Keywords: | Author Keywords: Gravitational waves detectors Interferometer Control systems Servo and control equipment Vibration isolation |
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