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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.
In-depth study of the physical mechanism of electron beam ionization on neutral gas, based on the particle simulation (PIC) software CHIPIC, designed a Monte Carlo (MCC) ionization collision module, and the electron and ion were tracked at the same time, successfully developed Full three-dimensional electromagnetic PIC / MCC code.The full 3D electromagnetic PIC / MCC code is validated by the software simulation of the helium relativistic backwave tube.The simulation results show that the filling gas can neutralize the space charge limiting effect and effectively increase the current Size; filling the right amount of gas can increase the power peak, extending the pulse width; excess gas will shorten the pulse width, reducing the peak power.