柱-孔汇聚结构的磁场拓扑结构分析

Analysis of Magnetic Field Topology Structure in Post-Hole Convolute

介绍了柱-孔汇聚结构(PHC)的特点,分析了PHC附近空间的磁场拓扑结构及其特点,通过3维电磁场仿真计算,验证了磁场拓扑结构的理论分析结果。同时,结合磁绝缘传输线稳态理论模型,定性分析了传输线间隙中电子漂移的特点。分析认为,由于PHC的引入,PHC上游侧的磁场将形成磁空缺,下游侧的磁场则会增强。磁场特殊的拓扑结构可能会使PHC下游侧附近的空间容易聚集大量空间电子,从而为间隙击穿提供基础。PHC电流传输效率实验的光学测量结果表明,在PHC下游侧附近的空间形成了明显的放电通道。

The paper introduces the structural characteristics of the post-hole convolute,analyzes the magnetic field topology structure and its characteristics in the space near PHC,and verifies the theoretical analysis results of the magnetic field topology structure through 3D electromagnetic field simulation calculation.At the same time,the characteristics of electron drift in transmission line gap are qualitatively analyzed based on the steady-state theoretical model of magnetically insulated transmission line.The analysis shows that the magnetic field on the upstream side of PHC will form a magnetic vacancy and the magnetic field on the downstream side will increase due to the introduction of PHC.The special topological structure of magnetic field may make the space near the downstream side of PHC easy to accumulate a large number of space electrons,thus providing a basis for gap breakdown.The optical measurement results of PHC current transfer efficiency show that the discharge channels are formed obviously in the space near the downstream side of PHC.