"Newtonian Noise Suppression by Adaptive Filtering"
Elena Gasparri
Mentors: Rana Adhikari and Phil Willems
Abstract:
The next generation of gravitational wave observatories are being designed to detect space-time strains down to 10 Hz where there is an except abundance of astrophysical sources (like the massive black hole mergers and the gravitational stochastic background). At such low frequencies the dominant noise buffeting the suspended mirrors of the interferometers is likely to be the seismic noise dued to the motion of the ground and the fluctuating Newtonian gravity gradients arising from density fluctuations in the ground and in the surrounding air. A way to achieve noise suppression is to perform active noise cancellation using the adaptive filter technique. In this article is explained how a such adaptive filter is been implemented and finally are shown the results obtained testing this filter at the 40-meter prototype laboratory.