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Budapest, Hungary
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Accadia T.,University of Savoy | Acernese F.,Complesso Universitario Of Monte gelo | Acernese F.,University of Salerno | Antonucci F.,National Institute of Nuclear Physics, Italy | And 225 more authors.
Astroparticle Physics | Year: 2011

The second science run of the Virgo gravitational wave interferometer took place between July 2009 and January 2010. This paper describes the performance of the interferometer longitudinal control system in terms of duty cycle, stability and control noise. A science data taking duty cycle of about 80% was obtained over the six month run. Control noise was not limiting the detector sensitivity at any frequency. A discussion of observed thermal effects in the detector operation is also included. © 2010 Elsevier B.V. All rights reserved.


Accadia T.,University of Savoy | Acernese F.,National Institute of Nuclear Physics, Italy | Acernese F.,University of Salerno | Antonucci F.,National Institute of Nuclear Physics, Italy | And 222 more authors.
Classical and Quantum Gravity | Year: 2011

The Virgo detector is a kilometer-length interferometer for gravitational wave detection located near Pisa (Italy). During its second science run (VSR2) in 2009, 6 months of data were accumulated with a sensitivity close to its design. In this paper, the methods used to determine the parameters for sensitivity estimation and gravitational wave reconstruction are described. The main quantities to be calibrated are the frequency response of the mirror actuation and the sensing of the output power. Focus is also put on their absolute timing. The monitoring of the calibration data and the parameter estimation with independent techniques are discussed to provide an estimation of the calibration uncertainties. Finally, the estimation of the Virgo sensitivity in the frequency domain is described and typical sensitivities measured during VSR2 are shown. © 2011 IOP Publishing Ltd.


Accadia T.,University of Savoy | Acernese F.,National Institute of Nuclear Physics, Italy | Acernese F.,University of Salerno | Antonucci F.,National Institute of Nuclear Physics, Italy | And 227 more authors.
Classical and Quantum Gravity | Year: 2010

Virgo is one of the large, ground-based interferometers aimed at detecting gravitational waves. One of the technical problems limiting its sensitivity is caused by light in the output beams which is backscattered by seismically excited surfaces and couples back into the main beam of the interferometer. The resulting noise was thoroughly studied, measured and mitigated before Virgo's second science run (VSR2). The residual noise during VSR2, which increases in periods with a large microseism activity, is accurately predicted by the theoretical model. The scattered light has been associated with transient events in the gravitational-wave signal of the interferometer. © 2010 IOP Publishing Ltd.

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