Physics
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997nimpa.394..397b&link_type=abstract
Nuclear Instruments and Methods in Physics Research Section A, v. 394, p. 397-408.
Physics
29
Scientific paper
The detection band of the interferometric gravitational wave detector VIRGO can be extended down to a few Hz by suspending each optical component of the interferometer from a chain of mechanical filters designed to suppress the transmission of seismic vibrations. Each mechanical filter supports the weight of the stages below it through a set of cantilevered blade springs. A system of permanent magnets, providing an ``antispring'' force, helps to reduce the highest vertical resonance of the chain from 7 Hz to about 2 Hz. This improvement allows VIRGO to reduce the frequency detection threshold from 10 Hz to about 4 Hz. A characterization of the mechanical filters is provided in this paper.
Beccaria Matteo
Bernardini M.
Bougleux E.
Braccini Saverio
Bradaschia C.
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