Abstract
A high sensitivity interferometer has been used to test the suspension of the Virgo interferometric antenna for gravitational wave search. Since Virgo is planning to enlarge the detection window down to 10 Hz, particular care is taken to improve the sensitivity in the low frequency region. Noise spectra are discussed. Between 20 and 100 Hz the limiting noise is of the order of 10 −14 m Hz , and it reaches 10 −15 m Hz above 100 Hz. Above 10 kHz the interferometer sensitivity is shot noise limited.
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