EXTENDING THE VIRGO GRAVITATIONAL-WAVE DETECTION BAND DOWN TO A FEW HZ - METAL BLADE SPRINGS AND MAGNETIC ANTISPRINGS

Authors
BECCARIA M BERNARDINI M BOUGLEUX E BRACCINI S BRADASCHIA C CASCIANO C CELLA G CUCCO E DAMBROSIO E DECAROLIS G DELFABBRO R DESALVO R DIVIRGILIO A FERRANTE I FIDECARO F FLAMINIO R GADDI A GENNAI A GENNARO G GIAZOTTO A HOLOWAY L LAPENNA P LOSURDO G MALIK S MANCINI S NICOLAS J PALLA F PAN HB PAOLETTI F PASQUALETTI A PASSUELLO D POGGIANI R POPOLIZIO P RAFFAELLI F VICERE A WAHARTE F ZHANG Z
Citation
M. Beccaria et al., EXTENDING THE VIRGO GRAVITATIONAL-WAVE DETECTION BAND DOWN TO A FEW HZ - METAL BLADE SPRINGS AND MAGNETIC ANTISPRINGS, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 394(3), 1997, pp. 397-408
Citations number
22
Categorie Soggetti
Nuclear Sciences & Tecnology","Physics, Particles & Fields","Instument & Instrumentation",Spectroscopy
Journal title
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment → ACNP
ISSN journal
01689002
Volume
394
Issue
3
Year of publication
1997
Pages
397 - 408
Database
ISI
SICI code
0168-9002(1997)394:3<397:ETVGDB>2.0.ZU;2-C
Abstract
The detection band of the interferometric gravitational wave detector VIRGO can be extended down to a few Hz by suspending each optical comp onent of the interferometer from a chain of mechanical filters designe d to suppress the transmission of seismic vibrations. Each mechanical filter supports the weight of the stages below it through a set of can tilevered 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 r educe the frequency detection threshold from 10 Hz to about 4 Hz. A ch aracterization of the mechanical filters is provided in this paper.