双模多注速调管电子光学系统的优化设计

发布时间：2018-05-10 20:39

本文选题：多注速调管 + 电子光学系统　；参考：《电子科技大学》2016年硕士论文

【摘要】：在单注管基础上采用多个电子注并联技术改进而来的多注速调管(MBK)属于一种新型微波电真空器件,其在工作电压、频带、效率、增益、体积和重量等方面比单注速调管更具技术优势。双模多注速调管可根据控制极电压的设置而工作在脉冲和连续波两种工作模式,此类速调管高频部分一般采用高次模的圆柱形谐振腔、同轴腔。数值计算表明,高次模谐振腔的电场能量最大位置分布在一个半径较大的圆周上,为获得高的驻波互作用效率,工程设计上往往将电子通道置于电场能量最大处,意味着多注电子通道处于旁轴位置。此结构布局将加剧横向磁场对注的干扰和影响。对称聚焦磁场中心线上横向磁场值最小,故要降低横向磁场的不良影响,得到层流性良好的聚焦电子注,需要使聚焦场对称中心尽量与电子注轴线重合。双模多注速调管电子光学系统的设计对开展相关项目的研制及拓展空心注电子枪的使用具有重要的意义,借助现有的电子光学模拟软件进行模拟仿真,是一种不错的辅助设计方法。但从计算资源和耗时方面看,利用三维电子光学模拟软件对整个多注电子光学系统进行模拟和分析不是很合算,因此,将多注系统简化为单注系统,再利用二维软件进行模拟研究不失为一种简便的间接设计方法。本课题以在研X波段75kW双模多注速调管的电子光学系统为研究对象,进行实例模拟和分析,以期设计出满足该多注速调管项目的电子光学系统。在设计中,首先对速调管多注电子光学系统提出了初步的设计方案和模拟方案,再采用TAU二维电子光学仿真软件对所设计的三种结构类型的单注电子枪进行编程计算和对比,为电子枪选型提供了参考。利用MAXWELL电磁仿真软件对磁聚焦系统进行建模和仿真,并分析横向场的影响。最后运用三维仿真软件MTSS对多注电子光学系统进行了仿真并与TAU的单注计算情况进行了比较,两者皆满足设计要求,表明了将多注系统简化为单注系统进行设计的方法是可行的。
[Abstract]:Multi-beam klystron (MBK) is a new type of microwave electric vacuum device, which is improved by using multiple electron beam parallel technology on the basis of single injection tube, and its working voltage, frequency band, efficiency, gain, etc. Volume and weight are more technical advantages than single injection klystron. Two-mode multi-beam klystron can work in pulse and continuous wave mode according to the voltage of control pole. The high frequency part of this kind of klystron is usually a cylindrical resonator with high order mode and coaxial cavity. Numerical calculation shows that the maximum position of electric field energy of high order mode resonator is distributed on a circle with large radius. In order to obtain high standing wave interaction efficiency, the electron channel is often placed at the maximum electric field energy in engineering design. It means that the multi-beam electron channel is in the side axis position. This configuration will aggravate the interference and influence of the transverse magnetic field on the beam. The transverse magnetic field on the center line of symmetrical focusing magnetic field is the smallest, so in order to reduce the adverse effect of transverse magnetic field and obtain a good laminar flow focusing electron beam, it is necessary to make the symmetry center of the focusing field coincide with the electron beam axis as far as possible. The design of a dual-mode multi-beam klystron electron optical system is of great significance to the development of related projects and the expansion of the use of hollow beam electron gun. It is a good aided design method. However, in terms of computing resources and time consuming, it is not very economical to simulate and analyze the whole multi-beam electron optical system by using the three-dimensional electronic optical simulation software. Therefore, the multi-beam system is simplified to a single-beam system. It is a simple and convenient indirect design method to use two-dimensional software to simulate. In this paper, we take the electron optical system of 75kW dual-mode multi-beam klystron in X-band as the research object, and carry on the example simulation and analysis, in order to design the electron optics system which satisfies the multi-beam klystron project. In the design, a preliminary design scheme and a simulation scheme for the klystron multi-beam electron optics system are put forward, and then the programming calculation and comparison of the three types of single beam electron gun designed are carried out by using TAU two-dimensional electron optics simulation software. It provides a reference for the selection of electron gun. The magnetic focusing system is modeled and simulated by MAXWELL electromagnetic simulation software, and the influence of transverse field is analyzed. Finally, the multi-beam electron optical system is simulated by using three-dimensional simulation software MTSS and compared with the single injection calculation of TAU. Both of them meet the design requirements. It is shown that it is feasible to simplify the multi-injection system into a single injection system.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN122

【参考文献】