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Measurement of the VIRGO superattenuator performance for seismic noise suppression

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42 Author(s)
Ballardin, G. ; Istituto Nazionale Fisica Nucleare, VIRGO Project, Sezione di Pisa, Italy ; Bracci, L. ; Braccini, S. ; Bradaschia, C.
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Below a few tens of hertz interferometric detection of gravitational waves is masked by seismic vibrations of the optical components. In order to isolate the mirrors of the VIRGO interferometer, a sophisticated suspension system, called superattenuator, has been developed. Its working principle is based on a multistage pendulum acting on seismic vibrations as a chain of second order mechanical low-pass filters. A complete superattenuator has been built and tested. This apparatus allows extending the VIRGO detection band down to a few Hz. A detailed description of the attenuation system and its performance are presented in this article. © 2001 American Institute of Physics.

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Review of Scientific Instruments  (Volume:72 ,  Issue: 9 )