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应用分析回旋行波管绝对不稳定性的Briggs-Bers相碰判据与小信号色散方程,并结合介质加载波导的冷场分析,通过数值计算比较了不同介质加载条件下回旋行波管工作模式的起振电流与寄生模式的起振长度,通过改变加载介质的特性参数从而增加行波损耗可以显著提高工作模式起振电流,并抑制掉寄生模式的返波振荡.结合介质加载波导冷场分析与回旋行波管小信号色散方程,分析了介质加载条件下回旋行波管小信号增益,给出了不同介质加载条件下的回旋行波管的小信号增益带宽曲线.在对介质回旋行波管自激振荡与小信号增益的综合分析基础上,对Kα波段的介质加载回旋行波管进行了具体的优化设计,给出了其工作参数的选取的依据与范围,为非线形分析提供了理论支撑与初始参数.
The Briggs-Bers collision criterion and the small signal dispersion equation for the analysis of the absolute instability of the gyrotron traveling wave tube are analyzed and compared with the cold field analysis of the dielectric loading waveguide. The working modes of the gyro-TWT under different loading conditions are compared The start-up current of the oscillating current and the parasitic mode can be increased significantly by changing the characteristic parameters of the loading medium so as to increase the starting current of the working mode and suppress the back-wave oscillation of the parasitic mode. The small signal dispersion equation of traveling wave tube is used to analyze the small signal gain of gyrotron TWT under the condition of medium loading. The small signal gain bandwidth curve of gyrotron TWT under different loading conditions is given. Based on the comprehensive analysis of excitation oscillation and small signal gain, the optimal design of Kα-band medium loaded gyrotron traveling wave tube is given. The basis and range of its operating parameters are given, which provides theoretical support for the nonlinear analysis With initial parameters.