  In this paper a simple and very effective control system to monitor and
suppress the beam jitter noise at the input of an optical system, called Beam
Pointing Control (BPC) system, will be described showing the theoretical
principle and an experimental demonstration for the application of large scale
gravitational wave interferometers, in particular for the Advanced Virgo
detector. For this purpose the requirements for the control accuracy and the
sensing noise will be computed by taking into account the Advanced Virgo
optical configuration and the outcomes will be compared with the experimental
measurement obtained in the laboratory. The system has shown unprecedented
performance in terms of control accuracy and sensing noise. The BPC system has
achieved a control accuracy of ~ $10^{-8}$ rad for the tilt and ~ $10^{-7}$ m
for the shift and a sensing noise of less than 1 nrad/$\sqrt{Hz}$ resulting
compliant with the Advance Virgo gravitational wave interferometer
requirements.
