Numerical Evaluation of Screening Current-Induced Magnetic Field in No-Insulation REBCO Coil Systems

Satomi Ueda, Atsushi Ishiyama, Hiroshi Ueda, So Noguchi

Research output: Contribution to journalArticlepeer-review

Abstract

We have been developing a no-insulation (NI) REBCO coil which is expected to be applied to medical accelerators and magnetic resonance imaging as a technology that can achieve both high thermal stability and high current density. Due to the flat shape and much greater, than the thickness, width of a REBCO-coated conductor, the screening currents are remarkably induced by changing the magnetic flux that penetrates the tape vertically. For insulated (INS) coils, this screening current causes an irregular magnetic field (screening current-induced magnetic field (SCIF)). Also, in the NI coil, an excitation delay occurs because of the current flowing in the radial direction with coil excitation. Therefore, as the cause of irregular magnetic field, it is necessary to simultaneously consider the influence of both the excitation delay and SCIF. In this study, we numerically investigate the magnetic field in the NI coil. The SCIF and an excitation delay reduce magnetic accuracy in the NI coil. Thus, we propose an energization waveform that can improve the magnetic field accuracy even if there is an excitation delay. Besides, we verified its effectiveness.

Original languageEnglish
Article number9372885
JournalIEEE Transactions on Applied Superconductivity
Volume31
Issue number5
DOIs
Publication statusPublished - 2021 Aug

Keywords

  • REBCO-coated conductor
  • excitation delay
  • no-insulation coil
  • screening current-induced magnetic field

ASJC Scopus subject areas

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

Fingerprint Dive into the research topics of 'Numerical Evaluation of Screening Current-Induced Magnetic Field in No-Insulation REBCO Coil Systems'. Together they form a unique fingerprint.

Cite this