Liquid helium-free 15 T superconducting magnet at 4 K

Junji Sakuraba, Yukio Mikami, Keiichi Watazawa, Kazuo Watanabe, Satoshi Awaji

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We have successfully demonstrated a 15.1 T liquid helium-free superconducting magnet with a room-temperature bore of 52 mm using a Nb3Sn/NbTi hybrid coil, Bi2223 current leads and two Gifford-McMahon cryocoolers. The magnet has 830 mm outside diameter, 1221 mm height and 720 kg weight. The magnet was cooled to 3.6 K in 114 h. A central magnetic field of 15.1 T was achieved in 38 min. The temperature of the coil increased to 5.7 K due to ac losses during the excitation, but it decreased to 4.0 K before reaching 15.1 T. The temperature of the coil remained at a constant value of 3.8 K over the 24 h of operation. The demonstration indicated the usefulness of a liquid helium-free superconducting magnet to generate high magnetic fields up to 15 T.

Original languageEnglish
Pages (from-to)12-17
Number of pages6
JournalSuperconductor Science and Technology
Issue number1
Publication statusPublished - 2000 Jan 1

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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