Performances of compact magnetic field generators using cryo-cooled high temperature bulk superconductors as quasi-permanent magnets

T. Oka, Y. Hirose, H. Kanayama, H. Kikuchi, S. Fukui, J. Ogawa, T. Sato, M. Yamaguchi

Research output: Contribution to journalArticle

10 Citations (Scopus)


Two types of strong magnetic field generator have been newly constructed by using superconducting bulk magnets that mainly consist of rare earth 123 single domain compounds (REBa2Cu3Oy) in conjunction with different kinds of compact cryocoolers. The magnetic flux densities in the open space outside the vacuum chambers that contain bulk magnets have reached 3.37T and 2.78T when a Gifford-McMahon (GM) cryocooler and a Stirling-cycle (ST) pulse tube cryocooler cooled them to 30.8K and 62.0K, respectively. In this study, the activation of a bulk magnet was accomplished by field cooling magnetization using the static field of a 5T superconducting solenoid magnet. It was clarified that the trapped field distributions strongly reflect the temperature dependence of superconducting properties of the bulk magnet. The conditions for supplying intense fields in the open space are discussed to utilize them in practical applications. The most characteristic feature of superconducting bulk magnets is defined as a compact and strong magnetic field generator, which is discussed on the map from the industrial point of view.

Original languageEnglish
Pages (from-to)1233-1238
Number of pages6
JournalSuperconductor Science and Technology
Issue number12
Publication statusPublished - 2007 Dec 1


ASJC Scopus subject areas

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

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