Evaluation of Magnetic Field Homogeneity of a Conduction-Cooled REBCO Magnet with a Room-Temperature Bore of 200 mm

H. Miyazaki, S. Iwai, Y. Otani, M. Takahashi, T. Tosaka, K. Tasaki, S. Nomura, T. Kurusu, H. Ueda, S. Noguchi, Atsushi Ishiyama, S. Urayama, H. Fukuyama

    Research output: Contribution to journalArticle

    5 Citations (Scopus)

    Abstract

    Development of a higherature superconducting magnet wound with REBa2Cu3O7-δ (REBCO)-coated conductor for ultrahigh-field magnetic resonance imaging (MRI) is in progress. Our final targets are 9.4-T MRI systems for whole-body and brain imaging. Since REBCO-coated conductors feature high mechanical strength under a tensile stress and high critical current density, superconducting magnets could be made smaller by using REBCO coils. Superconducting magnets for MRI require homogeneous stable magnetic fields. The homogeneity of the magnetic field is highly dependent on the size and current density of the coils. Furthermore, in REBCO magnets, the screening-current-induced magnetic field that changes the magnetic field distribution of the magnet is one of the critical issues. In order to evaluate the magnetic field homogeneity and the screening-current-induced magnetic field of REBCO magnets, a conduction-cooled REBCO magnet with a roomerature bore of 200 mm was fabricated and tested. The REBCO coils were composed of 12 single pancakes, and the size of the homogeneous magnetic field region was 100-mm diameter spherical volume (DSV). The central magnetic field was as high as 1 T at 285 A. The magnetic field distribution on the z-axis was measured by using an NMR probe. The maximum error magnetic field was 470 parts per million (ppm) in the range from -50 to +50 mm, as well as in the coefficients of the spherical harmonic expansion for a 100-mm DSV. The error magnetic fields due to the screening-current-induced magnetic field were less than 5 ppm, because there was a sufficient distance between the coil and the homogeneous magnetic field region. The main reason for the error magnetic field was dimensional errors in the outer diameters and positions on the $z$-axis.

    Original languageEnglish
    Article number7414412
    JournalIEEE Transactions on Applied Superconductivity
    Volume26
    Issue number3
    DOIs
    Publication statusPublished - 2016 Apr 1

    Fingerprint

    homogeneity
    Magnets
    magnets
    Magnetic fields
    conduction
    cavities
    evaluation
    room temperature
    magnetic fields
    Temperature
    Superconducting magnets
    Induced currents
    superconducting magnets
    coils
    Magnetic resonance
    magnetic resonance
    Screening
    screening
    Imaging techniques
    conductors

    Keywords

    • conductioncooled
    • magnetic field homogeneity
    • MRI
    • REBCO-coated conductor

    ASJC Scopus subject areas

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

    Cite this

    Evaluation of Magnetic Field Homogeneity of a Conduction-Cooled REBCO Magnet with a Room-Temperature Bore of 200 mm. / Miyazaki, H.; Iwai, S.; Otani, Y.; Takahashi, M.; Tosaka, T.; Tasaki, K.; Nomura, S.; Kurusu, T.; Ueda, H.; Noguchi, S.; Ishiyama, Atsushi; Urayama, S.; Fukuyama, H.

    In: IEEE Transactions on Applied Superconductivity, Vol. 26, No. 3, 7414412, 01.04.2016.

    Research output: Contribution to journalArticle

    Miyazaki, H, Iwai, S, Otani, Y, Takahashi, M, Tosaka, T, Tasaki, K, Nomura, S, Kurusu, T, Ueda, H, Noguchi, S, Ishiyama, A, Urayama, S & Fukuyama, H 2016, 'Evaluation of Magnetic Field Homogeneity of a Conduction-Cooled REBCO Magnet with a Room-Temperature Bore of 200 mm', IEEE Transactions on Applied Superconductivity, vol. 26, no. 3, 7414412. https://doi.org/10.1109/TASC.2016.2529841
    Miyazaki, H. ; Iwai, S. ; Otani, Y. ; Takahashi, M. ; Tosaka, T. ; Tasaki, K. ; Nomura, S. ; Kurusu, T. ; Ueda, H. ; Noguchi, S. ; Ishiyama, Atsushi ; Urayama, S. ; Fukuyama, H. / Evaluation of Magnetic Field Homogeneity of a Conduction-Cooled REBCO Magnet with a Room-Temperature Bore of 200 mm. In: IEEE Transactions on Applied Superconductivity. 2016 ; Vol. 26, No. 3.
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    AU - Tasaki, K.

    AU - Nomura, S.

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    AU - Ueda, H.

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