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Low-temperature superconductors (LTS) require liquid helium, yet can only generate a magnetic field lower than 24 T. For full-fledged commercialization of superconducting equipment, high temperature superconducting (HTS) conductors are preferred as they can be cooled by the more cost-efficient liquid nitrogen and they can generate a much higher magnetic field, such as 30 T at 4.2 K. However, one of the major drawbacks of the HTS conductor is its short maximum length of a single conductor wire, typically <500 m. As a result, many joints need to be installed in the superconducting equipment, resulting in a difficult manufacturing process and a complicated operating procedure. Thus, we commenced a 10-year JST-MIRAI Program in 2017, focusing on developing the joint technology for linking HTS conductors. The program has two important research and development directions:
A brief review of the JST-MIRAI Program, initial results of the investigation on superconducting joints, preliminary results for the medium field persistent NMR magnets, and the current status of the joints for railway systems.