螺旋槽回旋行波管高频特性分析

 在Foulds等人对螺旋槽结构进行深入分析的基础上，考虑了槽区内高次模式对慢波结构高频特性的影响。结果表明：槽宽较小时，结论与其结论吻合较好； 槽宽较大时，计算结果与其有较大差别。此外，讨论了螺旋槽结构参数对高频特性的影响，结果表明：除槽宽外的其它结构参数固定时，存在一个最佳的δ/L值，可以获得较弱的色散和较大的横向场幅值，适合做回旋行波管互作用结构。

Analysis on dispersion characteristics of helical groove gyro TWT

Base on the Foulds′ theory about the propagation of an electromagnetic wave through a helical waveguide, the effect of the higher-order modes in the groove is taken into account. The dispersion diagram obtained from calculation agrees very well with the results of reference when the groove width is smaller and different from the instance of bigger groove width. Moreover, some characteristics of helical groove gyrotwt are discussed. The results shows that when the structure parameters (except groove width) are fixed, there is a best value of groove width to pitch, it can obtain relatively weak dispersion characteristics and big amplitude of transverse electric field. The helical groove structure can be used in the gyrotwt.