Performance of a mechanical bridge joint for 30-kA-class high-Temperature superconducting conductors

Satoshi Ito, Kenji Kawai, Yutaro Seino, Tatsuya Ohinata, Yusuke Tanno, Nagato Yanagi, Yoshiro Terazaki, Kyohei Natsume, Shinji Hamaguchi, Hiroki Noguchi, Hitoshi Tamura, Toshiyuki Mito, Akio Sagara, Hidetoshi Hashizume

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


In this report, we propose segment-fabricated hightemperature superconducting (HTS) magnets as candidates for the FFHR-d1 heliotron-Type fusion reactor. The FFHR-d1 requires 100-kA-class superconducting conductors used at 12 T for a pair of helical coils. We fabricated and tested two 30-kA-class GdBCO conductors with bridge-Type mechanical lap joints (mechanical bridge joints). This report details the design of the joint section and the experimental results of those samples, especially, those of their joints. We improved the geometry of the joint region in a second sample, based on our results from the first. The second sample has sufficiently low joint resistance (less than 5 nω), and we could apply 70 kA to it without causing quenching at the joint. Its joint resistance was also acceptable for providing the electric power required to run the cryoplant for the segmented HTS helical coils.

Original languageEnglish
Article number6663646
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - 2014


  • Fusion reactors
  • High-Temperature superconductors
  • Power cable connecting
  • Superconducting magnets

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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