Cryogen-free hybrid magnet for magnetic levitation

K. Watanabe, K. Takahashi, I. Mogi, G. Nishijima, S. Awaji, M. Motokawa

Research output: Contribution to journalConference articlepeer-review

28 Citations (Scopus)


The development of a cryogen-free hybrid magnet with no use of liquid helium was intended. A cryogen-free hybrid magnet is composed of an outer conduction-cooled superconducting magnet using GM-cryocoolers and an inner water-cooled resistive magnet. As a first step, we constructed a cryogen-free NbTi superconducting magnet with a 360 mm room temperature bore, which generated 4.5 T at a magnet center. The thermal stability concept of the critical current margin is adopted for magnet design. A 20 T static magnetic field and a magnetic force field corresponding to 2030 T2/m by combining with the 15.5 T water-cooled magnet were obtained. A container-less melting experiment was carried out using a newly developed 20 T cryogen-free hybrid magnet. A great interest is focused on Marangoni convection in container-less melting. Thermocapillary convection known well as Marangoni is being investigated in the non-gravity state due to high magnetic fields, using the world's first cryogen-free hybrid magnet.

Original languageEnglish
Pages (from-to)485-489
Number of pages5
JournalPhysica C: Superconductivity and its applications
Publication statusPublished - 2003 Apr 15
EventICMC 2002 - Xi an, China
Duration: 2002 Jun 162002 Jun 20


  • Cryogen-free hybrid magnet
  • NbTi
  • Thermocapillary convection

ASJC Scopus subject areas

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


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