![Mechanical filter of a superattenuator (January 2016)](http://public.virgo-gw.eu/wp-content/grand-media/image/AdVirgo_Superattenuator_Filter_201601_0009.jpg)
Superattenuators are used to suspend the main interferometer mirrors and benches to isolate them from the seismic ground vibrations. Here, a mechanical attenuator, part of a superattenuator, is being installed. The attenuator is then enclose in a vacuum tower.
Credits: Cyril Frésillon/Virgo/Photothèque CNRS