分布损耗对回旋行波放大器稳定性的影响

基于电磁模式的色散方程和回旋管非线性理论，研究了损耗层厚度对回旋行波放大器注-波互作用的影响.结果表明，合理选择损耗层电导率和厚度能够让期待的工作模式TE₀₁衰减较小，而对应的竞争模式TE₂₁因损耗很大而更难以起振，随厚度的增加，放大带宽从两边向中间收缩变窄，频带中间部分的输出功率会上升，曲线更加平坦，从而达到改善互作用稳定性的目的. 关键词： 回旋行波放大器 起振长度 起振频率 饱和功率

Influence of distributed wall loss on stability of gyrotron traveling wave amplifier

Based on the dispersion equation of electromagnetic mode and the nolinear theory of gyrotron traveling wave amplifier (gyro-TWA), the influence of the thickness of the lossy layer on beam-wave interaction in the gyro-TWA is studied. The simulation results show that large attenuation for competing mode TE₂₁ can be realized while that of operating mode is small by appropriately choosing the thickness and conductivity of the lossy layer. The bandwidth decreases with the increase of the thickness, but the output power of the middle of the bandwidth increases and becomes more smooth. This is useful for improving the stability of gyro-TWA.