Feasibility Study for Elimination of the Screening Current-Induced Fields in HTS Coil

K. L. Kim, S. Hahn, Y. H. Choi, Y. G. Kim, D. H. Kang, K. Kazikawa, Haigun Lee

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Herein, we report a feasibility study for elimination of the screening current-induced field (SCIF) in fully insulated (INS) and no-insulation (NI) GdBCO coated conductor (CC) coils exposed to an external AC magnetic field generated by background solenoid copper coils. Prior to investigating the effects of external AC magnetic fields on SCIF in the GdBCO CC coils, the magnetic flux density (Bz) was calculated using the equivalent circuit model and compared to the Bz obtained empirically to quantify the SCIF in the INS and NI coils. The value of the SCIF in the NI coil was smaller than that in the INS coil without the use of an external AC magnetic field, due to the current paths originating from the turn-to-turn and layer-to-layer contacts, suggesting that the screening current dissipated by contact resistance during charging. When the INS and NI coils were exposed to the external AC magnetic field, the Bz of the coils increased gradually, and eventually saturating to the calculated Bz values, indicating full removal of the SCIF. In addition, the SCIF of the NI coil could be removed under subjection to a lower external AC magnetic field compared to the INS coil, due to the lower SCIF occurring in the NI coil after charging.

Original languageEnglish
Pages (from-to)83-88
Number of pages6
JournalJournal of Superconductivity and Novel Magnetism
Volume28
Issue number1
DOIs
Publication statusPublished - 2014

Fingerprint

Induced currents
elimination
Screening
coils
screening
Insulation
insulation
Magnetic fields
alternating current
magnetic fields
charging
conductors
Solenoids
Magnetic flux
Contact resistance
Equivalent circuits
Copper
solenoids
contact resistance
equivalent circuits

Keywords

  • GdBCO CC
  • No-insulation
  • Screening current-induced field
  • Solenoid coil
  • Vortex shaking effect

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Feasibility Study for Elimination of the Screening Current-Induced Fields in HTS Coil. / Kim, K. L.; Hahn, S.; Choi, Y. H.; Kim, Y. G.; Kang, D. H.; Kazikawa, K.; Lee, Haigun.

In: Journal of Superconductivity and Novel Magnetism, Vol. 28, No. 1, 2014, p. 83-88.

Research output: Contribution to journalArticle

Kim, K. L. ; Hahn, S. ; Choi, Y. H. ; Kim, Y. G. ; Kang, D. H. ; Kazikawa, K. ; Lee, Haigun. / Feasibility Study for Elimination of the Screening Current-Induced Fields in HTS Coil. In: Journal of Superconductivity and Novel Magnetism. 2014 ; Vol. 28, No. 1. pp. 83-88.
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