Rare-earth oxide high-temperature superconducting (REBCO) wire is expected to be applied as a basic material to realize a continuous sustainable carbon-neutral society. However, it does not yet sufficiently suppress the probabilistic local non-uniformity in the wire manufacturing, and the performance optimization of the wire, reliability, yield and cost are still insufficient for full-scale mass production and commercialization. Innovation of the wire manufacturing technology based on scientific knowledge, therefore, has become an urgent issue. This study aims at 1) clarifying the current transport properties of long REBCO wire in actual application environments by fusion of material fabrication processing, measurement engineering, data science and superconductivity engineering, and 2) pioneering a new fundamental technology and science for mass production of the REBCO wires satisfying such requirements as high current carrying capability, high uniformity, reproducibility, controllability, high robustness and low cost, which supports the actual application of REBCO wires. In this talk, the following are described in detail. 1. Nondestructive and non-contact measurements and theoretical expression for the in-field electric-field-vs.-current density (E-J) characteristics of REBCO wire including ultra-low electric field regions. 2. Current transport properties of long REBCO wires under the influence of local inhomogeneity at low temperature and in-field conditions, which has been investigated by means of high-speed reel-type magnetic microscopy coupled with machine learning. 3. A novel data-driven approach for modeling and control of industrial scale Pulsed Laser Deposition (PLD) wire manufacturing processes. 4. Development of highly robust conductors by Face-to-Face Double Stacked (FFDS) architecture.

This work was supported by JSPS KAKENHI Grant Number JP19H05617.