螺旋线行波管电子效率改善的数值模拟

 运用全电磁2.5维粒子模拟软件MAGIC和3维高频结构仿真软件HFSS，模拟仿真了正-负双跳变慢波结构对螺旋线行波管电子效率的改善，从慢波系统高频参量、非同步参量、增益参量和电子注相位等角度进行了讨论。设计并加工了一支采用双跳变结构的螺旋线行波管，实测结果表明：采用双跳变结构后可将电子效率从19%提高到29%；模拟仿真方法得到的平均相对误差为5%左右。

Efficiency enhancement simulation of helix traveling-wave tube

2.5-dimensional(2.5-D) particle-in-cell simulation code MAGIC and 3-D electromagnetic simulation code HFSS were used to investigate the helix traveling-wave tube(TWT) with positively-negatively tapered structure for efficiency enhancement.Some key parameters to efficiency were analyzed,including high-frequency parameter,non-synchronous parameter,gain parameter and electron phase.A positively-negatively tapered helix TWT were designed and fabricated.The results show that the measured efficiency of the tapered TWT reaches 29%,while that of the non-tapered TWT is 19%.It shows the average relative error of the simulation method is about 5%.