针对双开槽的双光栅开放式谐振腔, 提出了一种基于矩形波导谐振腔理论的计算方法, 给出TE04模式场分布的结构设计修正公式, 用于进行准光学谐振腔结构设计优化, 通过增强电子注区域的电场强度, 可有效提高电子效率。同时对双光栅慢波结构“冷”色散特性进行了计算, 分析了不同参数对其高频特性的影响。结果表明, 双光栅槽宽和电子注通道宽度的变化会对其色散特性的频带上限产生较大影响。

A calculation method based on rectangular waveguide cavity theory for the open resonance structure with double-row grating and double-groove was proposed. The corrected formula of TE04-mode in the quasi optical cavity structure was proposed for the design optimization, and the electronic efficiency was improved effectively by enhancing the electric field intensity in electron beam tunnel. The cold dispersion character of double-row grating slow-wave structure and the impacts of different parameters on the high frequency characteristic were calculated and analyzed. The results show that the widths of the double-row grating and the electron beam tunnel have great impact on the dispersion character.