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本文讨论了开槽圆柱波导的高频场分布，给出了注波互作用自洽非线性理论．在电子作大回旋运动与考虑速度零散的情况下，采用四阶龙格库塔法，对均匀截面开槽波导3次谐波回旋行波放大管往波互作用进行了数值计算，得出一些重要的互作用规律，为回旋行波放大管的进一步研究打下了基础．
In this paper, we discuss the high-frequency field distribution of slotted cylindrical waveguide and give the self-consistent nonlinear theory of the wave-wave interaction. Using the fourth order Runge-Kutta method, the numerical simulation of the reciprocation of the third harmonic wave gyro-traveling wave amplifier tube with uniform cross-section slotted wave is carried out in the condition that the electrons make big gyrocompass and the scattered velocity is considered. The important laws of interaction lay the foundation for the further study of gyrotron traveling wave amplifier.