Pulsed-field magnetization applied to high-Tc superconductors

Applied Superconductivity Pub Date : 1998-02-01 DOI:10.1016/S0964-1807(98)00106-9

U. Mizutani , T. Oka , Y. Itoh , Y. Yanagi , M. Yoshikawa , H. Ikuta

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引用次数: 120

Abstract

The pulsed-field magnetization (PFM) technique has been elaborated as the most efficient and effective tool in magnetizing the melt-processed high-T_c bulk superconductor in the temperature range 30–80 K. The dynamic motion of magnetic fluxes penetrating into the YBCO superconductor during the PFM operation has been analyzed and the flux propagation speed has been accurately evaluated. The viscous force is found to play a very crucial role in the PFM process. Detailed analysis of the flux motion in the presence of both viscous and pinning forces enabled us to find a very efficient method for magnetization by the PFM operation. The iteratively magnetizing pulsed field operation with reducing amplitudes abbreviated as ‘IMRA’ has been developed and proved to be very effective in magnetizing high-T_c superconductors at temperatures as low as 30 K. By making full use of these findings, we constructed a prototype quasi-permanent magnet system capable of producing magnetic field of 0.8 T in the outerspace at 7 mm above the surface of the magnetized YBCO superconductor.

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应用于高温超导体的脉冲场磁化

脉冲场磁化(PFM)技术是在30 ~ 80k温度范围内对熔融加工的高tc块状超导体进行磁化的最有效的方法。分析了磁通在PFM工作过程中穿透YBCO超导体的动态运动，准确地计算了磁通的传播速度。发现粘滞力在PFM过程中起着至关重要的作用。通过对粘滞力和钉紧力作用下磁通运动的详细分析，我们找到了一种非常有效的PFM磁化方法。已经开发了一种迭代磁化脉冲场操作，其减幅缩写为“IMRA”，并被证明在低至30 K的温度下对高tc超导体进行磁化是非常有效的。通过充分利用这些发现，我们构建了一个能够在磁化YBCO超导体表面以上7mm处产生0.8 T磁场的准永磁体原型系统。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Applied Superconductivity

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