Trapped field characteristics of Y-Ba-Cu-O bulk in time-varying external magnetic field

Hidehito Shimizu, Hiroshi Ueda, Makoto Tsuda, Atsushi Ishiyama

Research output: Contribution to journalConference articlepeer-review

8 Citations (Scopus)


It is very important to clarify characteristics of trapped field in HTS bulk exposed to an external AC magnetic field in application of high-temperature superconducting bulk to motors, magnetic levitation systems, bulk magnets and so on. We have experimentally investigated the transition of trapped field while applying external AC magnetic field to a disk-shaped YBCO bulk. The observed trapped-field attenuation is different from that by flux creep, i.e., zero external field. It may be considered that the trapped-field attenuation is affected by external AC magnetic field, particularly temperature rise due to AC loss. In this paper, electromagnetic behaviors within the bulk exposed to external AC magnetic field, especially supercurrent distribution, are investigated numerically using a simulation code based on the finite element method (FEM) considering voltage-current (E-J) characteristic. We focus on the relationship between the transition of supercurrent distribution within the bulk while applying external AC magnetic field and both n-value of E-J characteristic and temperature rise by AC loss.

Original languageEnglish
Pages (from-to)820-823
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


  • AC loss
  • External AC magnetic field
  • FEM
  • n-value
  • Trapped field attenuation
  • YBCO bulk


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