What I find particularly troubling about the design of tokamak reactors is that on one hand you have magnets that need to be cooled to -250C or whatever the “high” temperature is nowadays and in the middle of it you have plasma that will leak thermal radiation in any way possible. The magnets themselves will heat up from running large electric currents through them. This just feels like a recipe for a disaster - if things suddenly stop working, due to heat or otherwise you have a very hot, radioactive plasma trying to equalise its energy with the outer world...