All superconductors superconduct, but there's wide variation in how strong of a magnetic field they can endure before leaving the superconducting state: https:/

All superconductors superconduct, but there's wide variation in how strong of a magnetic field they can endure before leaving the superconducting state: https://www.researchgate.net/figure/Upper-critical-fields-and-coherence-lengths-for-sev-eral-type-II-superconductors-The_tbl1_273297345 https://www.researchgate.net/figure/Upper-critical-fields-an... ITER (and the LHC) used NbSn magnets, since it was designed in the 90s. Newer designs will use newer superconductors.