螺旋波纹壁圆柱波导回旋行波放大器的非线性模拟
Nonlinear simulation of gyro-TWT amplifier with helical interaction waveguide
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摘要: 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%。Abstract: 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.
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