Here's a fun table at which field strengths various superconductors fall out of the superconducting mode https://www.researchgate.net/figure/Upper-critical-fiel

Here's a fun table at which field strengths various superconductors fall out of the superconducting mode 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 uses NbTi, SPARC uses YBCO.