Speaker
Description
Seismic vibration and local disturbances of any origin represent a nodal problem of ground-based detectors for Gravitational Waves observations and studies. The INFN Pisa group has been involved for more than 25 years in this research field, and it has collected fundamental experience on the development of the Superattenuator (SA), the best mechanical system in the world conceived for filtering vibrations at the level of the optical elements. This has been done to extend the detection bandwidth of the Advanced VIRGO interferometer in the low frequency region down to 5 Hz or better.
The Superattenuator is a complex system based on the working principle of a multi-stage pendulum suspended from an Inverted Pendulum structure adopted as a pre-isolation stage and acting in the frequency region around 50 mHz. The filtering performance is centered on the passive action of the multistage pendulum combined with the active feedback strategy applied in different points along the mechanical structure and for different frequency bands.
In this talk, we present an overview of the passive performance of our seismic isolation system considering the possibility to use it in a similar experimental context conceiving an anti-vibrational mechanical system with less demanding requirements.
The upgrades in progress on the cantilever spring blades and magnetic anti-spring (MAS) will be also described in view of the project for the next generation Seismic Isolation System of the Einstein Telescope (ET) and its underground giant laboratory for Gravitational Waves observation.