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An improvement in the VIRGO Super Attenuator for interferometric detection of gravitational waves: The use of a magnetic antispring

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14 Author(s)
Braccini, S. ; INFN, Sezione di Pisa and Dipartimento di Fisica, Universitá di Pisa, Pisa, Italy ; Bradaschia, C. ; Cobal, M. ; Del Fabbro, R.
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We present a method of lowering below 2.5 Hz the vertical normal mode frequencies of the Pisa Super Attenuator by using permanent magnets which provide an antispring force. This method allows a more efficient suppression of the seismic noise decreasing the lower limit of the frequency region devoted to gravitational wave detection.  

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Review of Scientific Instruments  (Volume:64 ,  Issue: 2 )