Analysis of the mode composition of an X-band overmoded O-type Cerenkov high-power microwave oscillator
Analysis of the mode composition of an X-band overmoded O-type Cerenkov high-power microwave oscillator
复制标题
DOI：
10.1063/1.4757636
复制
发表时间：
2012-10
影响因子：
2.2
通讯作者：
Dian Zhang;Jun Zhang;H. Zhong;Zhenxing Jin
中科院分区：
文献类型：
--
作者：
Dian Zhang;Jun Zhang;H. Zhong;Zhenxing Jin
O型切伦科夫高功率微波源采用大直径过模慢波结构，具有很高的功率容量。然而，在过模O型切伦科夫HPM源中，可以同时输出多个模式。为了获得高的模式纯度，在优化这类器件结构时，需要对输出功率的模式组成进行定量分析。本文介绍了两种定量分析质点胞腔模型中模态组成的精确数值方法。在此基础上，分析了X波段O型切伦科夫振荡器在过模慢波系统（D/λ <$2.7）下的模式组成。分析表明，适当选择过模慢波系统和电子束的参数是重要的，如以前的报告中提到的，实现模式选择的注波互作用。此外，很少讨论的模式转换效应的设计也会影响输出功率的模式纯度。个...
Overmoded slow wave structures (SWSs) with large diameter are utilized in O-type Cerenkov high-power microwave (HPM) sources for their high power capacity. However, multi-modes may be output simultaneously in the overmoded O-type Cerenkov HPM sources. In order to achieve high mode purity, the mode composition of the output power should be analyzed quantitatively when the structure of this type of device is being optimized. Two accurate numerical methods of making quantitative analysis of the mode composition in particle-in-cell model are introduced in this paper. And then, the mode composition of an X-band O-type Cerenkov oscillator with overmoded SWSs (D/λ ≈ 2.7) is analyzed. The analysis indicates that appropriate selection of the parameters of overmoded SWSs and electron beam is important, as mentioned in previous reports, for realizing mode selection in beam-wave interaction. Besides, designing of the mode conversion effect, which is rarely discussed, can also affect the mode purity of output power. A...