同轴相对论返波管波束作用物理机制研究

项目名称： 同轴相对论返波管波束作用物理机制研究

项目编号： No.11305130

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 滕雁

作者单位： 西北核技术研究所

项目金额： 28万元

中文摘要： 同轴相对论返波管（CRBWO）是一种新型高效高功率微波（HPM）产生器件。实现高效输出时，CRBWO的波束作用具有不同于空心返波管的特点：电子束流与前向波发生同步作用，作用的频率范围很宽，可能诱发模式竞争；电子束流与非同步波发生显著能量交换，当-1次空间谐波(非同步波)与同步波幅度相近时，模式竞争得到抑制。目前，对CRBWO波束作用物理机制并无清晰认识，特别对非同步波束作用和-1次空间谐波对模式竞争的抑制缺乏充分研究。本项目针对CRBWO波束作用的特点建立理论模型，分析重要工作参数对CRBWO结构波特性的影响，研究同步波与非同步波在束流调制和能量交换中的作用，根据同步波与非同步波的幅度之比和相位关系，揭示CRBWO波束作用的物理机制。基于理论研究，探索并提出二极管电压1 MV水平下抑制模式竞争、实现高效输出的CRBWO设计原则与方法，为CRBWO的进一步发展和实用化提供理论基础和技术支持。

中文关键词： 同轴相对论返波管；波束作用；两端反射；非同步波；能量交换

英文摘要： Coaxial relativistic backward wave oscillator (CRBWO) is a new type of high power microwave (HPM) source device remarked by the high efficiency. While CRBWO works with the high efficiency, the physical mechanism of its wave-beam interaction is notably distinguishing from that in the hollow RBWO. The electron beam interacts synchronously with the forward harmonic, and the frequency range of the synchronous interaction is considerably wide, which is likely to induce the mode competition. The energy exchange significantly occurs between the electron beam and the asynchronous harmonics. The mode competition can be depressed when the amplitudes of -1st harmonic，i.e., the asynchronous harmonic, and the synchronous harmonic are close to each other. At present, little research has been done on the physical mechanism of the wave-beam interaction in CRBWO, especially on the asynchronous wave-beam interaction and the effect of the -1st harmonic on the mode competition. Our study aims to study the physical mechanism of the wave-beam interaction by establishing theoretical model based on the inherent characteristics of CRBWO. The impact of the important operation parameters on the structure wave is analyzed. And the performance of the synchronous and asynchronous harmonics in the beam modulation and the energy exchange is in

英文关键词： Coaxial relativistic backward wave oscillator；wave-beam interaction；reflections at both ends of the coaxial SWS；asynchronous harmonics；energy exchange