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A local control system for the test masses of the Virgo gravitational wave detector |
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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, Italy 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: | 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 μrad rms, enough to lock the interferometer and start the automatic alignment system. |
| Keywords: | Author Keywords: Gravitational wave detectors Seismic isolation Digital control |
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