| 脉冲充磁的超导圆盘的电流密度和俘获场分布的研究 |
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| 引用本文： | 何春勇,李晨,王建军,高政祥.脉冲充磁的超导圆盘的电流密度和俘获场分布的研究[J].低温物理学报,2003,25(4):278-286. |
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| 作者姓名： | 何春勇 李晨 王建军 高政祥 |
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| 作者单位： | 北京大学物理系,人工微结构和介观物理国家重点实验室,北京,100871 |
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| 基金项目： | 国家自然科学基金，国家重点项目，10174004，NKBRSF-G1999064602，， |
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| 摘 要： | 本从第一性原理出发，计算了充磁线圈产生的磁场，脉冲充磁的超导圆盘中的感应电流密度和俘获场分布．以超导体中的电流运动方程为基础，通过磁通动力学方程E=Ec(J/Jc)^n和物质方程B=μ0H表示超导圆盘的超导特性．计算表明第一个脉冲充磁电流的峰值和磁通蠕动指数对于超导圆盘中的感应电流分布非常重要．同时研究了充磁电流的宽度，波形，第二个充磁电流的峰值和充磁线圈的形状对于俘获场的影响．计算表明不断减小脉冲充磁电流峰值的反复充磁可以保持超导圆盘中的感应电流密度的平台在一确定水平．
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| 关 键 词： | 脉冲充磁 超导圆盘 电流密度 俘获场 第一性原理 超导电性 充磁线圈 超导体 |
INDUCED CURRENT DENSITY AND MAGNETIC FIELD IN A SUPERCONDUCTING-DISK MAGNETIZED BY MAGNETIC PULSES |
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| Abstract.INDUCED CURRENT DENSITY AND MAGNETIC FIELD IN A SUPERCONDUCTING-DISK MAGNETIZED BY MAGNETIC PULSES[J].Chinese Journal of Low Temperature Physics,2003,25(4):278-286. |
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| Authors: | Abstract |
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| Abstract: | The distribution of the induced current density and the profile of the trapped magnetic field in a superconducting-disk magnetized by magnetic pulses are calculated from first principles. The effect of the superconducting parameters is taken into account by the voltage-current law and the material law. The amplitude of the first magnetic pulse is the key factor to determine the distribution of the induced current density in the superconducting-disk, and the height of the induced current density plateau only depends on the flux creep exponent, regardless of the shape of the magnetizing coil. The iterative magnetic pulses with reducing amplitudes can keep the height of the induced current density plateau in a certain level. |
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| Keywords: | pulsed field magnetization induced current density trapped magnetic field |
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