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At those temperatures things get weird. Cryocoolers are established technology, but anything colder than the xx K range very quickly stops being easy in any way.

That said, LH2 temperatures aren't really hard and can easily fit in a 2U rackmount device, providing power/classical-RF uses of type2 superconductors. Think EMI shielding, power conditioning, ~50 GHz traces that can span a full backplane without fancy signal conditioning, etc.






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