A simple screening current-induced magnetic field estimation method for REBCO pancake coils

So Noguchi, Hiroshi Ueda, Seungyong Hahn, Atsushi Ishiyama, Yukikazu Iwasa

Research output: Contribution to journalArticle

Abstract

The development of NMR/MRI REBa 2 Cu 3 O y (REBCO, RE = rare earth) magnets is happening all over the world. It has been found that screening current-induced magnetic fields (SCMFs) are a serious problem for NMR/MRI magnets wound with REBCO tapes. The reduction of SCMFs is strongly desired, and the estimation of SCMFs is also desired at the design stage of REBCO magnets. In order to evaluate a SCMF, a finite element method (FEM) or a boundary integration method is needed thus far, and a high-level simulation technique is required. In this paper, we develop an easy method to estimate a SCMF without a high-level simulation technique. In this method, the inductance of a winding turn is calculated and then a screening current is estimated according to the magnetic field penetrating into the winding turn. The SCMF is obtained from the estimated screening current. The SCMFs computed by the proposed method were compared with measurements and simulation results of the FEM. The results agreed well, but we can see a large difference. However, the SCMFs found by the proposed method are accurate enough to know they are at the design stage without the use of a high-level simulation technique.

Original languageEnglish
Article number045007
JournalSuperconductor Science and Technology
Volume32
Issue number4
DOIs
Publication statusPublished - Mar 1 2019

Fingerprint

Induced currents
Screening
coils
screening
Magnetic fields
magnetic fields
Magnets
magnets
Magnetic resonance imaging
finite element method
simulation
Nuclear magnetic resonance
Finite element method
nuclear magnetic resonance
inductance
Inductance
Tapes
Rare earths
tapes
rare earth elements

Keywords

  • HTS magnet
  • REBCO magnet
  • screening current

ASJC Scopus subject areas

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

Cite this

A simple screening current-induced magnetic field estimation method for REBCO pancake coils. / Noguchi, So; Ueda, Hiroshi; Hahn, Seungyong; Ishiyama, Atsushi; Iwasa, Yukikazu.

In: Superconductor Science and Technology, Vol. 32, No. 4, 045007, 01.03.2019.

Research output: Contribution to journalArticle

Noguchi, So ; Ueda, Hiroshi ; Hahn, Seungyong ; Ishiyama, Atsushi ; Iwasa, Yukikazu. / A simple screening current-induced magnetic field estimation method for REBCO pancake coils. In: Superconductor Science and Technology. 2019 ; Vol. 32, No. 4.
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