螺旋线行波管电子效率改善的数值模拟
Efficiency enhancement simulation of helix traveling-wave tube
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摘要: 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。Abstract: 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%．
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