Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2001-05-28
Rev.Sci.Instrum. 72 (2001) 3653-3661
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
17 pages, 11 figures, accepted for publication on Review of Scientific Instruments
Scientific paper
10.1063/1.1394189
In order to achieve full detection sensitivity at low frequencies, the mirrors of interferometric gravitational wave detectors must be isolated from seismic noise. The VIRGO vibration isolator, called 'superattenuator', is fully effective at frequencies above 4 Hz. Nevertheless, the residual motion of the mirror at the mechanical resonant frequencies of the system are too large for the interferometer locking system and must be damped. A multidimensional feedback system, using inertial sensors and digital processing, has been designed for this purpose. An experimental procedure for determining the feedback control of the system has been defined. In this paper a full description of the system is given and experimental results are presented.
Ballardin G.
Braccini Saverio
Bradaschia C.
Calamai Giovanni
Cavalieri Renzo
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