IMPROVED LOW FREQUENCY SEISMIC NOISE ISOLATION SYSTEM FOR GRAVITATIONAL WAVE DETECTORS

An improved three-stage low frequency seismic noise isolation system for gravitational wave detectors, based on the cantilever spring, is presented. The measurement results show that the vertical and horizontal displacements of the test mass, at 10 Hz, reach 7×10−13 m/Hz and 1×10−12 mHz, respectively, and the isolation ratios of the system come to about 60 dB vertically and over 50 dB horizontally.