Upgrade design to a cryogen-free 20-t superconducting outsert for a 47-t hybrid magnet

K. Watanabe, S. Awaji, Y. Hou, H. Oguro, T. Kiyoshi, H. Kumakura, S. Hanai, H. Tsubouchi, M. Sugimoto, I. Inoue

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


A Rutherford flat cable composed of sixteen 0.8-mm-diameter Nb 3Sn strands with CuNb-reinforced stabilizers (CuNb/Nb3Sn) has been developed for use as an outsert for a 47-T hybrid magnet. To guarantee the safety of the magnet in the event of a quench, the low residual resistance ratio characteristic of arc-melted-in-situ CuNb composite had to be improved upon, and to obtain high electric conductivity, a new CuNb fabrication method using a Nb rod was attempted. The thermal runaway characteristics of chemical vapor deposition-YBa2Cu3O7-δ (Y123) coated-conductor tapes with varying Cu stabilizer thicknesses were measured in magnetic fields of up to 10 T at temperatures ranging from 17 to 60 K. It was found that the ratio of the thermal runaway over-current to the critical current decreases as temperature decreases and that thermal runaway occurs just above the critical current level at 5 K. The properties of a cryogen-free, 20-T superconducting outsert for a 47-T hybrid magnet utilizing CuNb/Nb3Sn Rutherford flat cables and Y123 tapes and having a room temperature bore of 400 mm were investigated.

Original languageEnglish
Article number6399571
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - 2013


  • Cryogen-free superconducting magnet
  • CuNb-reinforced NbSn
  • YBaCuO
  • hybrid magnet

ASJC Scopus subject areas

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


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