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讨论了耦合腔行波管大信号互作用的物理模型和三维计算机程序设计，考虑了电子注的圆环模型在径向、轴向的速度以及圆环旋转的角速度，详细研究了电子注对场的激励形式、返波的影响和相对论修正等因素，编制出了耦合腔行波管三维大信号程序。计算结果与实际相符。
The physical model and three-dimensional computer program design of large signal interaction in TWT are discussed. Considering the radial and axial velocities of the ring model and the angular velocity of the ring rotation, The form of excitation, the effect of backwave and the corrections of relativity and other factors, a three-dimensional large-signal program of coupled cavity TWT was developed. The calculation result is in accordance with the actual situation.