Also on the Wendelstein 7-X, the complexity of these things is amazing.

A bus bar electrical system that powers the magnets is so delicate that it must be lowered into position using helium balloons.

Vibration free, as many points of contact as you like and very cheap. Not many things about the Wendelstein 7-X are cheap, Wikipedia has it’s price tag at ~€1B.

Installing the bus bar system using helium balloons.
Installing the bus bar system using helium balloons.