MONITORING AND ADAPTIVE REMOVAL OF THE POWER SUPPLY HARMONICS APPLIED TO THE VIRGO READ-OUT NOISE

The VIRGO signal read-out system is based on a sixteen channels architecture. The system is now installed at the site and the noise of eight of the channels has been measured. The noise at 50 Hz and all its harmonics is coherent with a simultaneous measurement of the power supply. The power supply measurement has been used to remove the 50 Hz line and all its harmonics from the signal read-out noise.