Performance Test of Cryogen-Free Bi-2223 HTS Dipole Magnet for Beam Line Switching

Jun Yoshida, Atsushi Hashimoto, Hitoshi Mitsubori, Yukio Mikami, Keiichi Watazawa, Kichiji Hatanaka, Hiroshi Ueda, Mitsuhiro Fukuda, Tetsuhiko Yorita, Eisaku Ueno, Takeshi Kato

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


We have developed a Bi-2223 high-temperature superconducting dipole magnet for beam line switching at the cyclotron facility of the Research Center for Nuclear Physics, Osaka University. Exit beam lines are periodically switched by increasing and decreasing the magnetic field between 0 and 1.6 T with a switching time of 10 s. The magnet is equipped with two sets of Bi-2223 coil assemblies, which are conduction cooled by two 10-K Gifford-McMahon cryocoolers. We evaluated the superconducting property of the Bi-2223 coil assemblies in liquid nitrogen before installation in the cryostat. There were no degradation in wire performance during the assembly process. Magnetic field, strains, and temperatures of the coil assembly were investigated for performance verification after the magnet fabrication. The magnetic field and the temperatures meet specifications, and the deformation of the coil assembly is considered to be successfully suppressed by reinforcing structure. Furthermore, from a viewpoint of temperature, it is indicated that the magnet can make switching time and cycle time faster than that of the specified operation.

Original languageEnglish
Article number7404252
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - Apr 2016
Externally publishedYes


  • Accelerator magnets
  • high-temperature superconductors
  • superconducting coils
  • superconducting magnets

ASJC Scopus subject areas

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


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