3 ms·
High-temperature superconductor refers to the critical temperature at zero field. But the crucial field decreases sharply with temperature, so the superconducti
by scythe 1mo 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 1mo agoLiquid 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.
- _davide_ 1mo agowouldn't it make that much more dangerous?
- YakBizzarro 1mo agoyes... the only advantage of Hydrogen I can imagine is the abundance, for the rest I see only downsides. Helium is relatively abundant and technically renewable: it's a byproduct of gas extraction, since it's continuously produced by the alpha-nuclear decay inside the earth. Of course doesn't mean the offer is adequate with the market request, especially after the Hormuz crisis