推出了电子注与波的互作用功率、频偏和起振电流等公式，并进行了详细的讨论和分析。
And the formulas of electron beam to wave interaction power, frequency shift, starting current and etc. are derived. Then some discussions and analyses are carried out in detail.
进而建立了非均匀波纹慢波结构返波管的线性理论，给出非均匀慢波结构返波管中起振电流的计算表达式。
Furthermore, we established a linear theory of the non-uniform slow wave structures and formulated the expression of the starting current.
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