Input cavity characteristics with a two-beam loading are one of the most important scientific problems for using a two-beam scheme to develop compact, high-power millimeter-wave klystrons. This article focuses on this problem with a 400 kW two-beam loading in an overmoded input cavity which is proposed to develop a Ka-band klystron with peak power toward 150–200 kW. The input cavity exploits TM13 mode to support two equivalent sections of field gaps for modulating two beams. The beam loading parameters, such as Pt{P}_{t} , and Qb{Q}_{b} , and cavity parameters, such as electric field distribution, frequency ( f{f} ), and cavity Ql{Q}_{l} without beams can be optimized and selected to achieve matching absorption by two beams with a certain RF power injection in the Ka-band. The CST Studio Suite (CST) simulation results show that over 99% power of the input signal around 35 GHz can be absorbed by the input cavity loaded by two beams with Pt{P}_{t} of 0.473– 0.716 μP0.716~\mu \text{P} . Constant Pt{P}_{t} exercises about the same degree of two-beam loading on the input cavity.

中文翻译：

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双光束加载输入腔特性研究，用于开发紧凑型大功率Ka波段速调管


双光束加载的输入腔特性是使用双光束方案开发紧凑、高功率毫米波速调管的最重要的科学问题之一。本文重点讨论过调制输入腔中 400 kW 双光束负载的问题，建议开发峰值功率接近 150-200 kW 的 Ka 波段速调管。输入腔利用 TM13 模式支持两个等效的场隙部分来调制两束光束。梁加载参数，例如 Pt{P}_{t} 和 Qb{Q}_{b} ，以及腔参数，例如电场分布、频率 ( f{f} ) 和腔 Ql{Q}没有光束的_{l}可以被优化和选择，以实现Ka波段中具有一定射频功率注入的两个光束的匹配吸收。 CST Studio Suite (CST) 仿真结果表明，35 GHz 附近输入信号超过 99% 的功率可以被 Pt{P}_{t} 为 0.473–0.716 μP0.716~ 的两束光束加载的输入腔吸收。 \mu \text{P} 。常数 Pt{P}_{t} 在输入腔上施加大约相同程度的双光束负载。