螺旋波纹壁圆柱波导回旋行波放大器的非线性模拟

 给出了螺旋波纹壁圆柱波导回旋行波放大器非线性模拟中，处理偏模的初值问题和计算精度瞬时监测问题两项关键技术。采用这些技术编制的程序所得到的数值计算结果与Denisov等人实验观测值符合得很好。在此基础上，对电子束速度离散、螺旋开槽周期和开槽深度对效率的影响，进行了非线性模拟研究。结果表明：螺旋波纹壁圆柱波导回旋行波放大器效率对电子束速度离散不敏感，而对螺旋波纹开槽周期和开槽深度的依赖性较强；通过参数优化可望把目前实验的效率水平提高到25.6%。

Nonlinear simulation of gyro-TWT amplifier with helical interaction waveguide

Two key techniques are presented to treat the initial-value problem of the partial mode and to monitor the calculation error in the nonlinear simulation of a gyro-TWT amplifier with helical interaction waveguide.Based on these techniques,a code is programmed and simulation results are in good agreement with the experimental data recorded by Denisov G G,et al.Influences of the electron-beam velocity spread,the period and depth of the helical corrugations on the efficiency are studied.The results show that the beam-wave efficiency is not sensitive to the velocity spread,but is dependent on the period and depth of the helical corrugations,and that the efficiency in the present experiment may achieve 25.6% by optimizing the helical corrugation parameters.