矩形螺旋线行波管注-波互作用3维模拟
3D simulation of beam-wave interaction of rectangular helix traveling-wave tube
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摘要: 运用3D粒子模拟软件MAGIC分析了矩形螺旋线行波管(TWT)的注波互作用过程。模型设计了电导率线性渐变的电阻耦合器代替同轴输入输出结构来减少反射，消除自激震荡。仿真结果表明： 矩形螺旋线TWT模型能够进行有效的注波互作用，完全可以反映管内互作用的非线性本质，证明了模型设计的合理性，并对影响注波互作用的一些重要参量进行了讨论。设计的X波段TWT可达到的指标为：工作频率8~12 GHz，输出功率峰值达480 W，3 dB带宽为4 GHz，电子效率为11.8%。Abstract: The large-signal beam-wave interaction of rectangular helix traveling-wave-tube(TWT) is performed using 3D particle-in-cell simulation code MAGIC. The linear tapered resistance couplers were used to reduce reflections, which may avoid modeling the actual complex input and output geometries and reduce the numbers of unused elements. The simulation results show that the simulation model is valid to compute the beam-wave interaction inside the rectangular helix TWT, and some key parameters to the interaction were analyzed. The X-band TWT is designed with the design parameters as follows: operating frequency from 8 GHz to 12 GHz, the highest output power of 480 W, bandwidth 4 GHz, and its electron efficiency reaches 11.8%．
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