REBCO superconducting tape: 50-tesla fusion magnets and the rare-earth angle
Anen-o-me · reddit · 2026-09-18
A Reddit post introduces REBCO (rare-earth barium copper oxide) high-temperature superconducting tape: it works in magnets at around 50 teslas with a current density of 7 million amps per square centimeter, a key enabler for fusion reactor magnets.
The author notes it relies on rare earth metals—the same materials driving AI compute, solar cells, and robotics—arguing rare earths, not oil, are the strategic resource now.
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