Comment Re:LHC? (Score 1) 271
I believe their magnets are insulated in much the same way as the superconductors in the NMR I do maintenance on at work. The superconducting magnets are submerged in liquid helium. The liquid helium vessel is surrounded by a vacuum vessel to act as a layer of insulation/isolation. After that the whole thing is surrounded by another vessel containing liquid nitrogen which again is vacuum insulated, followed by more conventional insulation.
The liquid nitrogen, being quite cheap, is sacrificial. We need to top ours up every week or two. It absorbs the majority of the heat that radiates in through the first vacuum vessel.
The helium only needs to be topped up every 6 months or so.