Current-carrying capacity of YBa₂Cu₃O ₇-coated conductors for a 30T superconducting magnet

A 30 T superconducting magnet employing Ag/YBa₂Cu ₃O₇/Hastelloy (Y123) coated conductors would make precise fundamental research much more accessible. In order to investigate the feasibility of such a magnet, the current stability of the conductor was examined at 30T for B // c. Liquid helium cooled Y123-coated conductors with copper and silver stabilizing layers were examined for coil quench issues. Instability conditions were studied using a static zero-dimensional model for various copper stabilizing-layer thicknesses. The calculations indicate the existence of a stable sharing current in the copper stabilizer, of about 0.7 A per 1 μm of copper thickness at 30T in liquid helium. This sharing current in the copper stabilizer can be added to the 140% critical current of the Y123 conductor at 30T for B // c.