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中文摘要：
深入研究电子束对中性气体电离的物理机理，在粒子模拟（PIC）软件CHIPIC的基础上，设计了蒙特卡罗（MCC）电离碰撞模块，并对电子与离子同时进行了跟踪，成功研制了全三维电磁PIC/MCC代码．通过该软件对填充氦气相对论返波管的模拟，对全三维电磁PIC/MCC代码进行验证．模拟结果显示：填充气体可以中和空间电荷限制效应，有效提高电流大小；填充适量的气体可提高功率峰值，扩展脉冲宽度；过量的气体则会缩短脉冲宽度、降低峰值功率．
英文摘要：
Based on CHIPIC platform and the ionization physics mechanism between electron and gas, a full three-dimensional particle-in- cell/Monte Carlo （PIC/MCC） code is developed with the MCC ionized collision module. The simulations of a relativistic backward wave oscillator with helium gas are used to verify the code. The results show that the gas can enhance the current, peak power and pulse length, but too much gas leads to the reductions of peak power and pulse length.
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