In order to improve the vacuum in hhe 3-km tubes of Advanced Virgo, cryotraps have been installed at both ends of the tubes. Here the cryotrap at the north end prevents the residual water molecules to go from the tower to the tube. In the tower, a mirror is suspended to a superattenuator.
Credits: Cyril Frésillon/Virgo/Photothèque CNRS
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