Space charge distribution in magnetrons
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摘要: 回顾了几种磁控管理论模型，对这些理论模型中得到的电荷分布进行了分析。利用计算机对X波段磁控管进行PIC模拟，监视粒子相空间分布，并与理论结果进行对比，证明布里渊理论能部分解释轮轭层的高度及其内部的电荷密度分布，但模拟结果中电子在相空间存在一定的分布，而布里渊理论采用的是单粒子运动理论，因此无法解释模拟结果中轮轭边界下降沿特性。模拟得到的轮辐内电荷分布与各种理论均有较大差异，分析发现，不同的轮轭边界下降沿特性是造成差异的主要原因。讨论了利用导向中心流体理论得到更准确的轮辐内电荷分布的可能方法。Abstract: Some models of the space charge in magnetrons are reviewed. PIC simulations are taken on X band magnetrons to compare with the theory analysis. The Brilliouns theory is effective in getting the height and density of the hub, but it is difficult to explain charge density at the edge of the hub for the Brillouins theory uses single-particle motion theory. There is discrepancy in spoke density with all these theories. The difference of the charge density at the edge of the hub is assumed to be the reason for the discrepancy. Approaches to maintain spoke density in magnetrons are proposed according to the guiding center fluid theory in S.Riyopoulos work.
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Key words:
- PIC simulation /
- Brillouin density /
- guiding center /
- space charge /
- single-particle motion
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