Development of RE-Ba-Cu-O superconductors in the US for ultra-high field magnets

High-temperature superconductors (HTSs) make it possible to achieve magnetic fields beyond the 23.5 T limit of low-temperature superconductors. For higher energy density, high-performance HTS with J (e) > 1000 A mm(-2) enables reduction in coil winding length and a smaller magnet size. Among HTS, REBa2Cu3O7-delta (REBCO, RE = rare earth) exhibits excellent mechanical properties and superior performance over a wide range of temperatures and magnetic fields. REBCO tapes can be converted to various formats, including round wires. The state-of-the-art REBCO superconductors for ultra-high field magnets, including cable/wire architectures, are reviewed. R&D needs to address the remaining challenges with REBCO superconductors for ultra-high magnetic field applications is discussed.

Automated summary

High-temperature superconductors (HTSs) allow for magnetic fields beyond the limit of low-temperature superconductors. Among HTS, REBa2Cu3O7-delta (REBCO) exhibits excellent mechanical properties and superior performance. The challenges with REBCO superconductors for ultra-high magnetic field applications are discussed.