Spatial and temporal behavior of magnetic field distribution due to shielding current in HTS coil for cyclotron application

Hiroshi Ueda, Mitsuhiro Fukuda, Kichiji Hatanaka, Tao Wang, Atsushi Ishiyama, So Noguchi

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


We intend to develop and obtain a compact, high-efficiency and high-performance cyclotron using the high-temperature superconducting (HTS) magnet technology. In cyclotron applications, a high-accuracy magnetic field distribution with an isochronous field and an azimuthally varying field is spatially and temporally required for an HTS coil. In coils wound with HTS tapes, large shielding currents are induced in the HTS tape by the radial component of the magnetic field. The magnetic field generated by the shielding current affects the magnetic field distribution in the cyclotron application in the following issues: (1) field reduction by the shielding current, (2) accuracy of the field distribution, (3) temporal stability of the time-dependent shielding currents, and (4) field repeatability after charge and discharge repetitions. These effects are very critical in cyclotron applications. We developed a novel numerical simulation based on the finite element method, boundary integral equation, and fast multipole method. We investigated the spatial and temporal behavior of the magnetic field attributed to the shielding current in the HTS coil for the HTS cyclotron application.

Original languageEnglish
Article number4100805
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - 2013
Externally publishedYes


  • Cyclotron
  • high-accuracy magnetic field
  • shielding current
  • temporal stability

ASJC Scopus subject areas

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


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