金属双边二次电子倍增的理论分析与数值模拟
Theoretic analysis and numerical simulation of metal two-sided multipactor discharge
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摘要: 针对金属双边二次电子倍增现象，分析给出了电子共振方程、共振相位、相位聚焦条件以及碰撞电势；并根据二次电子发射的材料特性，研究了金属双边二次电子倍增的敏感区间。利用蒙特卡罗方法抽样选取电子初始发射能量和角度，数值研究了二次电子倍增的敏感区间，并与理论结果进行了比对，给出了二次电子数目随时间的增长关系。利用材料二次发射特性的经验公式，辅以电子碰撞角和碰撞能量计算以及对二次电子初始能量和发射角度的蒙特卡罗随机抽样算法，编制了3维全电磁粒子模拟程序NEPTUNE的金属边界二次电子发射功能模块，模拟金属双平板二次电子倍增过程，获得了二次电子倍增物理图像、二次电子数目随时间演化规律等结果。模拟结果不仅验证了理论分析，还表明在合适的条件下，空间电荷限制作用将导致二次电子倍增的饱和。
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关键词:
- 高功率微波 /
- 金属双边二次电子倍增 /
- 蒙特卡罗方法 /
- 3维全电磁粒子模拟程序
Abstract: In most HPM devices, multipactor discharge causes gas ionization and breakdown, and yields plasmas on surface. It would induce the shortening of output HPM pulses, and seriously deteoriate the performance of HPM devices. The metal two-sided multipactor discharge was theoretically analyzed and numerically simulated. Firstly, the dynamics equations, resonant phase, focusing phase, collision potential were introduced and analyzed in theory. Depending on material characteristic of secondary emission, the susceptibility curve of two-sided multipactor discharge was discussed. Secondly, using Monte Carlo method simulating the initial emission energy and angle, the susceptibility curve of two-sided multipactor discharge was studied and discussed compared with the theoretic results. And the relatio -
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