Development of Commercial RE123 Coated Conductors for Practical Applications by IBAD/PLD Approach

Longitudinal homogeneity and REBa2Cu3Ox: RE123 thickness dependence of in-field superconducting properties for commercial RE123 coated conductors (C.C.) were measured at varied temperatures. Self-field Ic homogeneity for typical ∼500-m long samples were evaluated below 2% measured by continues reel-to-reel measurement. In-field Ic distributions were not changed at temperatures from 10K to 77.3K, being estimated by Ic measurements at separated points of a 1 km long sample. Linear dependences of in-field Ic on RE123 thickness up to 5 μm were observed at temperatures of 20K and 77.3K, in contrast with non-linear dependences observed for self-field Ic for RE123 films. The results indicate good longitudinal homogeneity and universal linearity of thickness dependence for in-field Ic at wide temperature range, which suggest simple scaling for in-field Ic of RE123 wires among different temperatures.