Evaluation of Magnetic Field Distribution by Screening Current in Multiple REBCO Coils

Ayumu Mochida, Hiroshi Ueda, So Noguchi, Tao Wang, Atsushi Ishiyama, Hiroshi Miyazaki, Taizo Tosaka, Shunji Nomura, Tsutomu Kurusu, Shinichi Urayama, Hidenao Fukuyama

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5 Citations (Scopus)

Abstract

Coil systems are fabricated with various combinations of multiple coils in order to generate homogenous fields for NMR and MRI applications. In multiple coil systems using REBCO coils, the behavior of the screening current, which deteriorates field homogeneity, depends on the patterns of the transport current, the charging sequence of the coils, and the various resulting magnetic fields. It is therefore important to investigate and clarify the behavior of the irregular magnetic field and screening current in multiple coil systems under different operating environments. In a previous study, we experimentally and numerically clarified the different behaviors of irregular magnetic fields based on the charging sequence of coils in multiple-model REBCO coils [1], [2]. In this paper, we constructed the multiple-model REBCO coils in order to obtain the fundamental data for reducing or improving the resulting irregular magnetic field. Furthermore, the distribution of the irregular magnetic field in terms of the screening current was measured by using the reversal current method [3], [4]. We also calculated the spatial and temporal behavior of the irregular magnetic field by using our developed 3-D numerical simulation. Based on the experimental and numerical results, we discuss the behavior of the magnetic field in terms of the screening current when using the current sweep reversal method in multiple-model REBCO coils.

Original languageEnglish
Article number7434601
JournalIEEE Transactions on Applied Superconductivity
Volume26
Issue number4
DOIs
Publication statusPublished - Jun 2016

Keywords

  • HTS
  • REBCO
  • magnetic field distribution
  • multiple coils
  • screening current

ASJC Scopus subject areas

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

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    Mochida, A., Ueda, H., Noguchi, S., Wang, T., Ishiyama, A., Miyazaki, H., Tosaka, T., Nomura, S., Kurusu, T., Urayama, S., & Fukuyama, H. (2016). Evaluation of Magnetic Field Distribution by Screening Current in Multiple REBCO Coils. IEEE Transactions on Applied Superconductivity, 26(4), [7434601]. https://doi.org/10.1109/TASC.2016.2542980