Study for reducing the screening current-induced field in a 10-MHz no-insulation magnet using current sweep reversal method

Young Gyun Kim, Yoon Hyuck Choi, Dong Gyu Yang, Hyun Jin Shin, Min Cheol Ahn, Haigun Lee

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

This paper reports the effects of the current sweep reversal (CSR) method on the screening current-induced field (SCF) in a no-insulation (NI) magnet wound with high-Tc superconducting (HTS) coated conductor (CC), as determined experimentally and analytically. To quantify the SCF in the NI magnet, the magnetic flux density (Bz) was calculated using the equivalent circuit model and compared to the Bz obtained empirically. In addition, the charging scenario for the current sweep reversal (CSR) method was modified to eliminate the effect of the charging delay observed in NI magnets on the SCF. The SCF observed for the NI magnet charged directly at 30 A was markedly reduced when the magnet was subjected to the modified charging scenario for CSR at 36 A by decreasing the "hysteresis of the SCF" to zero base line. The results demonstrated the validity of the proposed approach for the enhancement of the temporal stability and spatial homogeneity of NI-NMR magnets via SCF reduction.

Original languageEnglish
Article number6939622
JournalIEEE Transactions on Applied Superconductivity
Volume25
Issue number3
DOIs
Publication statusPublished - 2015 Jun 1

Keywords

  • Current sweep reversal
  • no-insulation magnet
  • screening current-induced field

ASJC Scopus subject areas

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

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