Inertial Control of the VIRGO Superattenuator
Giovanni Losurdo (for Pisa, Florence VIRGO Groups)
TL;DR
This paper presents an inertial control method for the VIRGO superattenuator that effectively reduces mirror motion by combining accelerometer and position sensor feedback, improving interferometer stability.
Contribution
It introduces a wideband multidimensional inertial damping technique using DSP-based feedback with accelerometers and position sensors for the VIRGO superattenuator.
Findings
Mirror motion reduced within required limits
Effective suppression of residual superattenuator modes
Demonstrated success of inertial damping in operational conditions
Abstract
The VIRGO superattenuator (SA) is effective in depressing the seismic noise below the thermal noise level above 4 Hz. On the other hand, the residual mirror motion associated to the SA normal modes can saturate the dynamics of the interferometer locking system. This motion is reduced implementing a wideband (DC-5 Hz) multidimensional control (the so called inertial damping) which makes use of both accelerometers and position sensors and of a DSP system. Feedback forces are exerted by coil-magnet actuators on the top of the inverted pendulum. The inertial damping is successful in reducing the mirror motion within the requirements. The results are presented.
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