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Measurement of the seismic attenuation performance of the VIRGO Superattenuator |
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| Institution: | aINFN Sezione di Pisa and/or Universitá di Pisa, Via F.Buonarroti 2, I-56127, Pisa, Italy bINFN Sezione di Firenze-Urbino, Via G.Sansone 1, I-50019 Sesto Fiorentino (Firenze), Italy cUniversitá di Firenze, Largo E.Fermi 2, I-50125 Firenze, Italy dUniversitá di Urbino, Via S.Chiara 27, I-61029, Urbino, Italy eINFN Sezione di Roma 1 and/or Universitá “La Sapienza”, P.le A.Moro 2, I-00185, Roma, Italy fEuropean Gravitational Observatory (EGO), Via E.Amaldi, I-56021, Cascina (Pisa), Italy gINFN Sezione di Napoli and/or Universitá di Napoli “Federico II”, Complesso Universitario di Monte S.Angelo, Via Cinthia, I-80126, Italy hUniversitádi Salerno, Via Ponte Don Melillo, I-84084 Fisciano, Salerno, Italy iINFN Laboratori Nazionali di Frascati, Via E.Fermi 40, I-00044 Frascati, Roma, Italy jINFN Sezione di Perugia and/or Universitá di Perugia, Via A.Pascoli, I-06123, Perugia, Italy kESPCI—10, rue Vauquelin, 75005 Paris, France lSMA—IPNL 22, Boulevard Niels Bohr, 69622 Villeurbanne-Lyon Cedex, France mLaboratoire de l’Accélérateur Linéaire (LAL) IN2P3/CNRS, Université de Paris Sud, B.P. 34, 91898 Orsay Cedex, France nLaboratoire d’Annecy-le Vieux de physique des particules, Chemin de Bellevue, BP 110, 74941 Annecy-le-Vieux, Cedex, France oObservatoire de la Côte d’Azur, Departmént Frénel Intérférometrie Laser pour la Gravitation et l’Astrophysique, BP 4229, 06304 Nice Cedex 4, France |
| Abstract: | The gravitational wave detector VIRGO aims at extending the detection band down to a few Hertz by isolating the mirrors of the interferometer from seismic noise. This result is achieved by hanging each mirror through an elastic suspension (Superattenuator), designed to filter mechanical vibrations in all the degrees of freedom. An experimental upper limit of the mirror residual seismic noise at a few Hertz is provided in this paper. This is lower than the thermal noise floor, expected to limit the antenna sensitivity in the low frequency range. |
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