向内发射同轴虚阴极振荡器波束互作用的数值模拟研究

对向内发射同轴虚阴极振荡器微波主频进行了解析求解, 利用稳态相对论流体Maxwell方程组得到了微波主频所满足的方程; 同时使用MAFIA程序的TS3模块对向内发射同轴虚阴极振荡器中波束互作用进行了全三维PIC数值模拟研究, 通过对微波输出圆波导中5个传输模式的监测,得到了各模式的频谱分布及输出功率. 结果表明, 在有阳极反射板存在时, 构成的准腔结构能够有效地改善频谱, 从而提高能量转换效率.

Numerical Simulation Study on the Interaction of the Beam and Cavity Modes in an Inward-Emitting Coaxial Virtual Cathode Oscillator

The dominant frequency in an inward-emitting coaxial virtual cathode oscillator is solved analytically based on the steady-state relativistic-fluid-Maxwell equations. Full three-dimensional numerical simulation with the PIC method is carried out using the TS3 module of the MAFIA code. The frequency spectrum and the output power are obtained by monitoring the five propagating modes in the cylindrical output waveguide. The result shows that when the anode reflector exists, the frequency spectrum can be improved effectively by the formed quasi-cavity and hence the corresponding energy conversion efficiency can be enhanced.