三腔回旋速调管预群聚电流谐波分量研究

Study on Harmonic Contents in Prebunched Electron Beam in Three-cavity Gyroklystron Amplifier

该文基于小信号理论导出多腔回旋速调管预群聚电流密度谐波分量与群聚参数之间的关系,并以三腔回旋速调管为例进行了相应的数值计算。结果表明:二次谐波分量明显地小于基波分量,并且二次谐波分量随第二腔群聚参数变化起伏相对于一次谐波分量变化较大;二次谐波分量与第二腔群聚参数依赖关系与群聚腔的场强幅度的相位,第一漂移区引起电子相位变化有关;输入腔Q值在一定范围对谐波分量影响极小。

In this paper, based on a small-signal theory, an analytical expression for the harmonic contents in the prebunched electron beam in a multicavity gyroklystron is obtained. As an example, the dependence of the harmonic contents in three-cavity gyroklystron amplifier on the prebunched parameters is numerically calculated. The results show that the second harmonic content is much smaller than the fundamental harmonic content and the undulation of the second harmonic content depended on the second cavity prebunched parameters is greater than the fundamental one, and the amplitude of the second harmonics in the electron beam current density as functions of the hunching parameters is proportional to the field amplitude in the second cavity and relate with the electron phase shift resulting from the first drift region and the effect of input cavity Q in a certain range on the harmonic content is little or nothing.