New 25 T Cryogen-Free Superconducting Magnet Project at Tohoku University

Satoshi Awaji, Kazuo Watanabe, Hidetoshi Oguro, Satoshi Hanai, Hiroshi Miyazaki, Masahico Takahashi, Shigeru Ioka, Masahiro Sugimoto, Hirokazu Tsubouchi, Shinji Fujita, Masanori Daibo, Yasuhiro Iijima, Hiroaki Kumakura

Research output: Contribution to journalArticlepeer-review

52 Citations (Scopus)


The new high magnetic field research laboratory network is recognized as one of the Japanese Master Plans of Large Research Project by the Science Council of Japan. Recently, the project of the 25 T cryogen-free superconducting magnet (25 T-CSM), which is operated under a conductive cooling condition by cryocooler, was approved under the high magnetic field research laboratory network. We adopted a high strength CuNb/Nb3Sn Rutherford cable with a prebending treatment for the middle section coils of the 25 T-CSM. The central magnetic field of 14 T is generated by the operational current of 851 A by the Nb3Sn middle section and NbTi outer section coils in a 300 mm bore. The induced maximum hoop stress in the CuNb/Nb3Sn section is about 250 MPa. In addition, the 11.5 T high temperature superconducting insert coil is also designed using Gd123 tapes. Therefore, a total central magnetic field of 25.5 T can be achieved.

Original languageEnglish
Article number4302005
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - 2014 Jun


  • Coated conductor
  • cryogen-free superconducting magnet
  • high magnetic field
  • high strength NbSn Rutherford cable

ASJC Scopus subject areas

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


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