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The Virgo Collaboration; Accadia, T; Acernese, F; Barone, F; Basti, A; Bebronne, M; Beker, M. G; Belletoile, A; Bitossi, M; Bizouard, M. A; Blom, M; Bondu, F; Bonelli, L; Bonnand, R; Boschi, V; Bosi, L; Branchesi, M; Brillet, A; Brisson, V; Bulten, H. J; Buskulic, D; Buy, C; Cagnoli, G; Calloni, E; Canuel, B; Carbognani, F; Cella, G; Cesarini, E; Chaibi, O; Chiummo, A; Coccia, E; Cohadon, P. -F; Colacino, C. N; Conte, A; Dattilo, V; Debreczeni, G; Di Lieto, A; Emilio, M. Di Paolo; Dietz, A; Drago, M; Endroczi, G; Fafone, V; Ferrante, I; Fidecaro, F; Flaminio, R; Franc, J; Frasconi, F; Galimberti, M; Garufi, F; Gemme, G; Genin, E; Greverie, C; Leroy, N; Loriette, V; Majorana, E; Maksimovic, I; Mantovani, M; Marion, F; Marque, J; Martelli, F; Michel, C; Milano, L; Minenkov, Y; Morgado, N; Nocera, F; Palladino, L; Parisi, M; Pasqualetti, A; Passaquieti, R; Persichetti, G; Piergiovanni, F; Pietka, M; Pinard, L; Prato, M; Punturo, M; Rabeling, D. S; Racz, I; Rapagnani, P; Robinet, F; Rocchi, A; Romano, R; Rosinska, D; Ruggi, P; Swinkels, B; Tacca, M; Toncelli, A; Torre, O; Tournefier, E; Travasso, F; Brand, J. F. J. van den; Broeck, C. Van Den; van der Putten, S; Vasuth, M; Vedovato, G; Verkindt, D; Vetrano, F; Vinet, J. -Y; Vocca, H; Ward, R. L; Was, M
arXiv (Cornell University), 08/2011Journal Article
The Virgo gravitational wave detector is an interferometer (ITF) with 3km arms located in Pisa, Italy. From July to October 2010, Virgo performed its third science run (VSR3) in coincidence with the LIGO detectors. Despite several techniques adopted to isolate the interferometer from the environment, seismic noise remains an important issue for Virgo. Vibrations produced by the detector infrastructure (such as air conditioning units, water chillers/heaters, pumps) are found to affect Virgo's sensitivity, with the main coupling mechanisms being through beam jitter and scattered light processes. The Advanced Virgo (AdV) design seeks to reduce ITF couplings to environmental noise by having most vibration-sensitive components suspended and in-vacuum, as well as muffle and relocate loud machines. During the months of June and July 2010, a Guralp-3TD seismometer was stationed at various locations around the Virgo site hosting major infrastructure machines. Seismic data were examined using spectral and coherence analysis with seismic probes close to the detector. The primary aim of this study was to identify noisy machines which seismically affect the ITF environment and thus require mitigation attention. Analyzed machines are located at various distances from the experimental halls, ranging from 10m to 100m. An attempt is made to measure the attenuation of emitted noise at the ITF and correlate it to the distance from the source and to seismic attenuation models in soil.
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