Screening-Current-Induced Magnetic Field of Conduction-Cooled HTS Magnets Wound with REBCO-Coated Conductors

Hiroshi Miyazaki, Sadanori Iwai, Tatsuro Uto, Yasumi Otani, Masahiko Takahashi, Taizo Tosaka, Kenji Tasaki, Shunji Nomura, Tsutomu Kurusu, Hiroshi Ueda, So Noguchi, Atsushi Ishiyama, Shin Ichi Urayama, Hidenao Fukuyama

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    Superconducting magnets for magnetic resonance imaging systems require homogeneous, stable magnetic fields. The homogeneity of the magnetic field is highly dependent on the coils shape and positions. Furthermore, in REBa2Cu3O7-δ (REBCO) magnets, the screening-current-induced magnetic field, which changes the magnetic field distribution of the magnet, is one of the most critical issues. In the work described here, a small REBCO coil that can generate a magnetic field of over 10 T was fabricated and tested. The small REBCO coil was composed of a stack of 22 single pancake coils whose inner and outer diameters were 50 mm and 130 mm, respectively. The total conductor length was 1.5 km. The small REBCO coil could generate a central magnetic field of 8.27 T at 10 K. A magnetic field of over 10 T was achieved by replacing 12 of the single pancake coils with new ones wound with the latest REBCO-coated conductors. The measured value of the central magnetic field at 10 K was 13.53 T, which was lower than the calculated value of 13.94 T obtained without taking account of the screening-current-induced magnetic field. Furthermore, it was examined whether the current sweep reversal would be effective for 10 T-class magnetic field conditions.

    Original languageEnglish
    Article number7835760
    JournalIEEE Transactions on Applied Superconductivity
    Volume27
    Issue number4
    DOIs
    Publication statusPublished - 2017 Jun 1

    Keywords

    • conduction-cooled
    • REBCO-coated conductor
    • Screening-current-induced magnetic field

    ASJC Scopus subject areas

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

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  • Cite this

    Miyazaki, H., Iwai, S., Uto, T., Otani, Y., Takahashi, M., Tosaka, T., Tasaki, K., Nomura, S., Kurusu, T., Ueda, H., Noguchi, S., Ishiyama, A., Urayama, S. I., & Fukuyama, H. (2017). Screening-Current-Induced Magnetic Field of Conduction-Cooled HTS Magnets Wound with REBCO-Coated Conductors. IEEE Transactions on Applied Superconductivity, 27(4), [7835760]. https://doi.org/10.1109/TASC.2017.2657636