Construction of the cryogen-free 23 T hybrid magnet

K. Watanabe, S. Awaji, K. Takahashi, G. Nishijima, M. Motokawa, Y. Sasaki, Y. Ishikawa, K. Jikihara, J. Sakuraba

Research output: Contribution to journalConference articlepeer-review

11 Citations (Scopus)


In order to settle problems requiring a large amount of liquid helium and limiting the operation time for a wide bore superconducting magnet of a hybrid magnet, a cryogen-free 23 T hybrid magnet is being constructed at the High Field Laboratory for Superconducting Materials for the first time. An outer compact superconducting magnet is wound with highly strengthened CuNb/Nb3Sn multifilamentary wires and is refrigerated conductively by GM-cryocoolers. The maximum stress value of 210 MPa was designed for the CuNb/Nb3Sn coil. The cryogen-free superconducting magnet will be operated using dual power supplies independently, and has potential to generate central fields of 4.59 T at 198 A for the outer section NbTi coil and 3.41 T at 145 A for the inner section CuNb/Nb3Sn coil. When the cryogen-free 7.5 T superconducting magnet with a 360 mm room temperature bore is combined with an inner 15.5 T water-cooled resistive magnet, a cryogen-free hybrid magnet will achieve 23.0 T in a 52 mm room temperature experimental bore.

Original languageEnglish
Pages (from-to)678-681
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number1
Publication statusPublished - 2002 Mar
Event17th Annual Conference on Magnet Technology - Geneva, Switzerland
Duration: 2001 Sept 242001 Sept 28


  • Cryogen-free superconducting magnet
  • CuNb reinforcing stabilizer
  • High magnetic field
  • Hybrid magnet


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