Speaker
Description
In the future linear collider CLIC, the electromagnets focussing the beams of particles will have to be extremely stable, at the nanometre scale. In order to fulfil such stringent requirements, a prototype of coil-free active isolation system has been developed. This presentation will summarize the latest results obtained with our active isolation system. It consists of an extended frame representing a dummy electromagnet, whose vibrations are measured by an optical inertial sensor and which is supported by eight active legs. Each leg consists of a piezoelectric actuator in series with a metallic suspension. The controller used will also be presented along with experimental results. The feedback operation leads to an active isolation in a frequency range between 0.3 Hz and 30 Hz, with a peak of reduction by a factor 100 at 1 Hz. Finally, limitations of the performance will be discussed.
