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研究了等离子体填充下相对论运该管的频率特性。结果表明，随着等离子体浓度增加，返波管的振荡频率明显上移；对空波导情况，实验结果同理论分析结果是相符的。
The frequency characteristics of the tube under relative plasma flow were studied. The results show that as the plasma concentration increases, the oscillation frequency of the backwave tube rises obviously. The experimental results agree well with the theoretical analysis for the case of the empty waveguide.