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human_llm 4 hours ago [-]
I found it odd that they call it high-temperature, but then perform all their experiments at 4.2 K. Also, at 4.2 K, the magnet performs worse than established Nb-Ti technology, so it doesn't seem to be a significant advancement.
scythe 3 hours ago [-]
High-temperature superconductor refers to the critical temperature at zero field. But the crucial field decreases sharply with temperature, so the superconducting phase appears concave on a T–B phase diagram. Therefore, in order to operate superconducting magnets at high field, liquid helium is necessary irrespective of the superconducting transition temperature (critical temperature).
namibj 6 minutes ago [-]
Liquid hydrogen cooled superconductors (20K) would be good especially if we manage to use some materials that don't suffer hydrogen embrittlement processed/machined economically enough to really play out the cost benefits of not relying on the rare noble gas.
Simboo 3 hours ago [-]
That’s awesome!!!!
fnord77 4 hours ago [-]
don't MRI machines run at temps around 4-5K?
human_llm 3 hours ago [-]
Yes, they operate at 4.2 K (liquid helium temperature).
stavros 16 minutes ago [-]
Jesus Christ, a regular MRI is cooled that close to absolute zero? Insane.