アジア太平洋の各国における超伝導技術の現状

Abstract

Twenty seven years ago, the family of ceramic cuprate materials namely REBa_2Cu_3O_y (REBCO, RE: rare earth) exhibited superconductivity at above liquid nitrogen temperature, which opens the hope for a lot of exciting applications such as low-loss cables, generator, magnetic resonance imaging (MRI) and superconducting magnetic energy storage (SMES). However, before reaching the required performance, there are many scientific and technological hurdles should be overcome. The brittle ceramics are not easily formed into flexible conductors; high current levels require near-perfect crystallinity; and superconducting performance drops rapidly in a magnetic field. Recently, despite these obstacles, thousands of kilometres of REBCO wire have now been manufactured for demonstrations of medical and electrical power components especially in Asia and Pacific Area. The task for materials scientists is how to squeeze as much performance as possible from these wonderful and difficult materials. In this work, we study the status of Research and Development of REBCO wire in Asia and Pacific Area. Moreover, based on the result, we create a new nanoengineered REBCO wire to enhancement of superconducting properties for required levels of practical magnet applications derived by Metal-Organic deposition (MOD).