回旋行波放大器输出端反射对注-波互作用的影响

基于回旋行波放大器的非线性自洽理论，研究渐变输出端反射对回旋行波放大器注-波互作用的影响.数值模拟结果表明，对于Ka波段TE₀₁模基波工作回旋行波放大器，渐变输出端渐变角的变化以及互作用长度的改变将导致不同的反射系数幅度和相位，从而影响注-波互作用过程，改变功率演化过程.在输出饱和功率不变的情况下，合理选择输出渐变角，可能可以减小注-波互作用长度，展宽互作用频带.关键词：回旋行波放大器注-波互作用反射系数

Influence of reflection of the output port on beam-wave interaction in gyrotron traveling wave amplifier

Based on the nonlinear self-consistent theory of gyrotron traveling wave amplifier (gyro-TWA)，the influence of the reflection from the tapering output port on the beam-wave interaction in the gyro-TWA is studied. The simulation results show that the amplitude and phase of the reflection coefficient resulting from the variation of the tapering angle at the output port and the beam-wave interaction length have great effect on the beam-wave interaction for a Ka band TE₀₁ gyro-TWA. Reasonably selecting the tapering angle at the output port may increase the beam-interaction frequency bandwidth with a relatively short beam-wave interaction length while keeping the saturated output power of the gyro-TWA at almost the same level.