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目前回旋放大器的稳定性分析主要采用单模理论,而该理论不能分析模式间的相互影响。多模稳态理论可以分析不同模式间的相互影响,现有的多模理论仅可以分析光滑波导或内壁加载石墨涂层的波导结构,该结构并不适合高平均功率工作。本文首次将回旋行波放大器的多模稳态理论应用于适合于高平均功率的损耗介质加载波导模型,并分析了回旋返波振荡的存在对工作模式的影响。以TE_(01)模基波工作的Ka波段回旋行波管为例,研究介质损耗正切和输入功率的变化对回旋返波振荡的抑制作用。相较于使用PIC仿真方法,利用多模理论,可以快速地分析工作模式得到稳定放大的过程。
At present, the stability analysis of the cyclotron mainly adopts single-mode theory, which can not analyze the interaction between modes. The multimode steady state theory can analyze the interaction between different modes. The existing multimode theory can only analyze the waveguide structure of the smooth waveguide or the inner wall loaded graphite coating, which is not suitable for high average power operation. This paper, for the first time, applies the multi-mode steady-state theory of a gyrotron traveling-wave amplifier to a loss dielectric loading waveguide model suitable for high average power, and analyzes the effect of the existence of gyro-return oscillation on the operating mode. Taking Ka-band TWTs operating at fundamental mode TE_ (01) as an example, the effects of dielectric loss tangent and input power on the gyrotron return-wave oscillation are investigated. Compared with the use of PIC simulation method, the use of multi-mode theory, you can quickly analyze the work mode to obtain a stable amplification process.