Measurement and Simulation of Magnetic Field Generated by Screening Currents in HTS Coil

Hiroshi Ueda, Mitsuhiro Fukuda, Kichiji Hatanaka, Kenta Michitsuji, Hiraku Karino, Tao Wang, Xudong Wang, Atsushi Ishiyama, So Noguchi, Yoshinori Yanagisawa, Hideaki Maeda

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

In coils wound with high-temperature superconducting (HTS) tapes, large screening currents are induced in the tape by the radial component of the magnetic field. Furthermore, when a transport current is supplied to the HTS tape under a magnetic field, the total current (which consists of the transport and screening currents) flows inhomogeneously. The magnetic field generated by the screening currents affects the magnetic field distribution in cyclotron applications. Investigating the effects of the screening currents on the reduction, hysteresis, and drift of the magnetic field in the HTS coil is therefore necessary. In our previous studies, we have developed a novel simulation code for a three-dimensional electromagnetic field with the aim of clarifying these effects. In the present study, we measured the reduction and hysteresis of the magnetic field generated by the screening currents for a small model of HTS pancake coil. Additionally, we numerically investigated the influence of the screening current in the HTS coil on the spatial and temporal behavior of the magnetic field using our developed simulation code, which considers the nonlinear voltage - current characteristics.

Original languageEnglish
Article number6709817
JournalIEEE Transactions on Applied Superconductivity
Volume24
Issue number3
DOIs
Publication statusPublished - 2014 Jun 1

Keywords

  • HTS coil
  • hysteresis
  • magnetic field distribution
  • screening current

ASJC Scopus subject areas

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

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