低温工学
Online ISSN : 1880-0408
Print ISSN : 0389-2441
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  • 高橋 雅人
    2018 年 53 巻 4 号 p. 203-209
    発行日: 2018/07/20
    公開日: 2018/08/03
    ジャーナル フリー

    The magnetic field stability of superconducting magnets powered by external power supplies has been investigated. The magnetic field fluctuation caused by current fluctuation generated in the external power supply is classified according to its frequency and range. Superconducting magnets for high-resolution NMR (Nuclear Magnetic Resonance) require one of the highest stability in the variety of application. It is demonstrated that high temperature superconducting magnets in driven mode can be applicable for high-resolution NMR. Such kind of technology will also be used for the future field swept NMR of quadrupolar nuclei which is now being developed.

  • 白井 康之, 横山 彰一
    2018 年 53 巻 4 号 p. 210-217
    発行日: 2018/07/20
    公開日: 2018/08/03
    ジャーナル フリー

    We have been developing a conduction cooled HTS-MRI that is driven by a power supply in order to solve the long-lasting attenuation of the screening current induced on superconducting tapes at the time of initial excitation and the difficulty with REBCO tape superconducting junctions, as well as a superconducting switch for persistent current operation. A power supply system consisting of two exciters, one for charging and discharging and the other for holding the magnet current, is proposed and developed. The supply system is equipped with a control block to compensate the magnetic field deviation caused by the screening current. We carried out a magnetic field stability experiment using a 32-H HTS-MRI magnet excited by the power supply system proposed which was equipped with specially designed micro-current control.

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