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讨论了PIC-MCC方法的基本原理以及在UNIPIC软件中的编程实现,并用该软件模拟了充填不同种类气体在不同气压下相对论返波管的气体电离过程,讨论了所产生的等离子体对电子束的传输以及波束相互作用的影响.给出了返波管输出功率、频率和起振时间随气体种类和气压等参数的变化情况.模拟结果表明,电离产生的阳离子是返波管性能改善的原因,而腔内滞留的低能电子是破坏返波管振荡而引起脉宽缩短的重要因素.
The basic principle of the PIC-MCC method and its programming in the UNIPIC software are discussed. The gas ionization process of the relativistic backwave tube filled with different kinds of gases at different pressures is simulated by the software. The effects of the generated plasma on the electron beam And the influence of the beam interaction are discussed.The output power, frequency and start-up time of the backwave tube are changed with the parameters such as gas type and pressure.The simulation results show that the cation generated by ionization is the reason for the improvement of the backwave tube performance , While the low-energy electron trapped in the cavity is an important factor that causes the pulse width to be shortened due to the oscillation of the back-wave tube.