多注行波管PPM聚焦磁场设计方法研究  

Design of Periodic Permanent Magnetic Focusing System forMulti-Beam Traveling Wave Tubes

作　　者：邓光晟[1,2,3] 杨军[1,2] 阮久福[1,2] 吕国强[1,2,3] 吴华夏[1,2,3,4] 沈旭东[4] 

机构地区：[1]省部共建现代显示技术国家重点实验室,合肥230009 [2]合肥工业大学光电技术研究院,合肥230009 [3]合肥工业大学计算机与信息学院,合肥230009 [4]安徽华东光电技术研究所,芜湖241002

出　　处：《真空科学与技术学报》2013年第6期528-534,共7页Chinese Journal of Vacuum Science and Technology

摘　　要：对多注行波管周期永磁(PPM)聚焦结构中横向磁场的分布规律进行了研究,模拟分析了多注PPM聚焦系统中横向场的旋转对称特性,并对该系统中的电子流通率进行了分析。结果表明,单注PPM结构设计中普遍采用的横向磁场设计原则不适用于多注PPM聚焦结构,因为后者磁场的非旋转对称现象将随着电子通道内径向位置的增大而增强。本文针对多注PPM聚焦系统中横向磁场分布特点,提出了一种多注PPM聚焦磁场设计的一般性方法,首次将对磁场旋转对称性的判断纳入多注PPM磁场设计中。测试结果证明该方法对多注PPM聚焦磁场的设计提供了较好的指导作用。Here we addressed the design principles of the magnetic field in the periodic permanent magnet（PPM）fo- cusing structure of the muhi-beam traveling wave tubes. The rotational symmetry of the transverse magnetic field and the electron flow rate in the multi-beam PPM focusing system were modeled, simulated and tested. The simulated results show that the conventional design method of the transverse magnetic field in the single-beam PPM focusing structure fails to meet the design requirement of the multi-beam one, because as the radial position approaches the edge of the electron channel, the non-rotational synnnetry in the multi-beam PPM focusing system becomes increasingly significant. A novel design technique, based on the evaluation and optimization of the rotational symmetry, was developed and tested. We found that the newly-developed design method considerably improved the performance of the multi-beam PPM focusing system.

关 键 词：多注 周期永磁 横向磁场 设计方法 

分 类 号：TN124[电子电信—物理电子学]