Magnetic Field Quality Evaluation of a 20-T Cryogen-Free Superconducting Magnet with a Bi2223 Insert

Satoshi Awaji, Hidetoshi Oguro, Kazuo Watanabe

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The magnetic field stability such as relaxation and a magnetic field hysteresis of a practical 20-T cryogen-free superconducting magnet (20 T-CSM) with a Bi2Sr2Ca2Cu3Oy (Bi2223) insert coil was investigated. The relaxation of a central magnetic field is basically related to the flux creep phenomena in the magnetization of the Bi2223 tapes. We found that the relaxation rate $S$ of the magnet is more than two orders smaller than that of the Bi2223 tapes. The magnetic field stability of the 20 T-CSM becomes less than 2 G/h even at 19 T after a lapse of half a day from the charging. It is small enough for the solid-state NMR studies. However, the repeating excitation increases the central magnetic field beyond the saturated values under the relaxation.

Original languageEnglish
Article number7422034
JournalIEEE Transactions on Applied Superconductivity
Volume26
Issue number4
DOIs
Publication statusPublished - 2016 Jun

Keywords

  • BiSrCaCuO tape
  • High magnetic field
  • High temperature superconductor
  • Magnetization
  • Relaxation
  • Superconducting magnet

ASJC Scopus subject areas

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

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