Study on elimination of screening-current-induced field in pancake-type non-insulated HTS coil

K. L. Kim, J. B. Song, D. G. Yang, Y. G. Kim, T. H. Kim, S. K. Kim, M. W. Park, Haigun Lee

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

This paper presents the details of a recent study on the removal of the screening-current-induced field (SCIF) in a pancake-type non-insulated high-temperature superconductor coil (NI coil). To determine the SCIF in the NI coil, the magnetic flux density (B z) was calculated using the equivalent circuit model of the coil and compared to the B z obtained empirically. The experimental results indicate that the SCIF elimination in the NI coil was enhanced upon increasing the amplitude and frequency of the AC current being supplied to the background coil. Moreover, the SCIF in the NI coil was successfully removed by applying the appropriate external AC magnetic field intensity. This is because the magnetization direction of the SCIF changed completely from radial to spiral, a phenomenon termed the 'vortex shaking effect.' Overall, this study confirmed that the SCIF in a pancake-type NI coil can be effectively removed by exposing the coil to an external AC magnetic field.

Original languageEnglish
Article number035009
JournalSuperconductor Science and Technology
Volume29
Issue number3
DOIs
Publication statusPublished - 2016 Feb 2

Keywords

  • high temperature superconductor
  • no-insulation
  • pancake coil
  • screening current induced field

ASJC Scopus subject areas

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

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