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Re:Livestream of Wendelstein 7-X Stellerator being turned on by the8472 on Wednesday February 03, 2016 @03:25PM (#11029474)
> and the shell is super-cooled to 4K

I think only the shells of the superconducting coils are cooled to those temperatures. The rest of the system, including the containment walls, are water-cooled.

In a real system you would also have neutron radiation carrying away energy that could be captured with additional layers of water.

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