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由于现有的互作用理论模型无法快速实时地研究瞬态导通现象并针对传输信号进行时频分析,适当改进了传统L.Brillouin模型螺旋线损耗部分的同时结合IBC模型的集中衰减器与切断设置方法,建立了螺旋线行波管的时域非线性互作用理论模型。在此基础上对一支行波管的瞬态导通过程进行粒子模拟(Particle-In-Cell,PIC)计算,通过针对互作用末端瞬态导通时间内传输信号进行的详细时频分析可知,电子注的前端截面无法理想地规则调制是输出信号杂乱和输出功率谱线异常等复杂瞬态现象产生的主要原因之一。
Due to the fact that the existing theoretical model of interaction is unable to study the transient conduction in real time and perform time-frequency analysis on the transmitted signal, the loss of the spiral part of the traditional L. Brillouin model is improved as well as the centralized attenuator combined with the IBC model Set up the method, set up the theoretical model of time-domain nonlinear interaction of helical traveling wave tube. On the basis of this, a Particle-In-Cell (PIC) calculation of the transient conductance of a traveling-wave tube is carried out. According to the detailed time-frequency analysis of the transmitted signal during the transient on-time at the interaction end, Electronic front-end cross-section can not be ideal modulation is the output signal disorder and output power spectral line abnormalities and other complex transient phenomenon is one of the main reasons.