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在工程应用上提供附加场的传统水冷铜线圈存在体积大、质量大、电耗高等显著缺点,因此体积小、质量小的高温超导磁线圈在附加场的磁等离子发动机(Applied-Field MagnetoPlasmaDynamic Thruster,AF-MPDT)中的应用受到了广泛关注。文章为满足0.2T的大孔径中心磁场需求,对内径160mm、高度30mm、材料为Bi-2333/Ag的三层双饼高温超导线圈进行了电磁特性试验研究。基于电输运法原理建立了高温超导线圈的临界电流测试系统,测量了不同层级和有无铁板情况下的线圈临界电流I_C。试验发现,不同层级的临界电流I_C最大有12%的差别,以中间层的I_C值最大;聚磁铁板对线圈电磁特性具有正面影响,最高能将I_C值提升42%。文章也开展了超导磁线圈电磁场仿真分析,研究了铁板尺寸和位置对线圈电磁特性的影响,得出了优化的聚磁铁板设计方案。
Conventional water-cooled copper coils that provide additional fields for engineering applications have significant disadvantages such as large volume, high mass, and high power consumption. Therefore, a small size and low mass HTS coil is used in an applied field magnetron plasma engine (Applied-Field MagnetoPlasmaDynamic Thruster , AF-MPDT) has received widespread attention. In order to meet the requirement of large aperture central magnetic field of 0.2T, the electromagnetic characteristics of a three-layer double-celled HTS coil with an inner diameter of 160mm, a height of 30mm and a material of Bi-2333 / Ag were investigated. Based on the principle of electric transport method, a critical current test system of high temperature superconducting coils was established. The critical current I_C of the coils at different levels and with and without iron plates was measured. The experimental results show that the maximum I_C of the different levels is 12%, and the I_C value of the middle layer is the largest. The magnetic field of the magnet has a positive effect on the electromagnetic characteristics of the coil, and the maximum I_C value can be increased by 42%. The article also carried out the electromagnetic field simulation analysis of the superconducting magnetic coil, studied the influence of the size and position of the iron on the electromagnetic characteristics of the coil, and obtained the optimized design plan of the magnetic plate.