Picosecond Breakdown in High-Voltage Open Pulse Discharge With Enhanced Secondary Electron Emission
Picosecond Breakdown in High-Voltage Open Pulse Discharge With Enhanced Secondary Electron Emission
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增强二次电子发射的高压开路脉冲放电中的皮秒击穿
DOI：
10.1109/tps.2017.2766888
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发表时间：
2017
影响因子：
1.5
通讯作者：
D. Zakrevsky
中科院分区：
文献类型：
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作者：
I. Schweigert;A. Alexandrov;P. Gugin;M. Lavrukhin;P. Bokhan;D. Zakrevsky
在使用反向传播电子束并施加上升时间在 10-20 ns 范围内的电压脉冲的高压开路放电实验中，记录了 300 ps 击穿。放电在中平面的两个阴极和栅极阳极之间进行，氦气压力为 10-35 Torr，电压为 5-13 kV。粒子内蒙特卡罗碰撞（PIC MCC）模拟表明，电子、离子和高能原子在电离和激发过程中的贡献对于当前的发展非常重要。在实验和动态 PIC MCC 模拟中研究了不同发射阴极材料（钛、碳化硅和 CuAlMg 合金）对放电电流演变的影响。发现来自阴极的二次电子发射是击穿最后阶段的主要过程。二次电子发射产率较高的阴极电流生长速率较大（高达700 A/cm2ns）。通过选择阴极材料、施加的电压幅度和气体压力，可以减少气体击穿的特征时间。
A 300-ps breakdown was registered in the experiments in the high-voltage open discharge with counter-propagating electron-beams with applying voltage pulses with rise times in 10–20 ns range. Discharge operates between two cathodes and grid-anode in the midplane at 10–35 Torr in helium at voltage 5–13 kV. It is shown in Particle-in-cell Monte Carlo collision (PIC MCC) simulations that the contributions of electrons, ions and energetic atoms in ionization and excitation processes are important for current development. The influence of different emissive cathode materials (titanium, silicon carbide, and CuAlMg-alloy) on evolution of discharge current is studied in the experiment and in kinetic PIC MCC simulations. The secondary electron emission from the cathodes is found to be a dominant process at the final stage of the breakdown. The current growth rate is larger (up to 700 A/cm2ns) for the cathode with a higher secondary electron emission yield. By choosing the cathode material, applied voltage amplitude and gas pressure, the characteristic time of the gas breakdown can be reduced.
影响因子：
--
作者：
Walker, C. G. H.;El-Gomati, M. M.;Zadrazil, M.
通讯作者：
Zadrazil, M.