双渐变螺旋线慢波结构参数分析及优化

 双渐变螺旋线慢波结构是空间行波管中使用最广的慢波结构之一。利用Christine大信号程序对该慢波结构各部分长度和螺距对行波管效率以及增益的影响进行了分析。结果显示:增益和电子效率与慢波结构长度成正比，且输入端的长度对增益影响最大；电子效率对相速增加段的螺距的变化最为敏感。根据分析结果，通过增加输入端长度，加大相速增加段的螺距,同时减小相速减小段的螺距进行优化。优化后，电子效率由35.4%提高至36.8%，增益由54.6 dB增加至56.2 dB。

Analysis and optimization of parameters of double-taper helical slow-wave structure

The double taper helix slow wave structure is one of the most widely used slow wave structures in space TWT. The effects of parameters such as length and pitch of double-taper helix slow wave structure on the electron efficiency and gain of TWT are investigated using the Christine large signal code. The result shows that the gain and the electron efficiency of TWT are in direct proportion to the length of each part of the slow wave structure, and the length of the signal input section has largest influence on the gain; the electron efficiency of the TWT is most sensitive to the pitch of the section where the phase velocity increases. Furthermore, the slow wave structure is optimized preliminarily by simultaneously increasing the length of the signal input section, reducing the pitch of th