电子注对谐振腔中TM模式谐振频率和电磁场分布的影响  

Influences of electron beam on resonant frequency and electromagnetic field distribution of TM modes in a cavity

作　　者：林福民[1] 张华福[1] 马晓兰[2] 

机构地区：[1]广东工业大学物理与光电工程学院,广州510006 [2]暨南大学物理系,广州510632

出　　处：《强激光与粒子束》2013年第7期1763-1769,共7页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(60671060);广东工业大学校内科研基金项目(405085039)

摘　　要：将电子注视为等离子体柱,从填充等离子体柱的谐振腔的物理模型出发,推导了圆柱腔填充中心电子注时TM0m0模式的特征方程,并重点分析了填充电子注的圆柱腔中TM010模式和TM020模式的谐振频率和电磁场分布随等离子频率的变化情况。研究结果表明,随着电子注的等离子体频率不断增大,谐振频率也不断增大,谐振腔内电场和磁场的分布也随之发生改变。当电子注的等离子体频率超过谐振腔的谐振频率时,谐振腔内的电磁场分布将发生很大的变化,出现了电子注内外电场方向相反和趋肤效应等现象。An electron beam was regarded as a plasma column, and the eigen frequency equations of the TMo,n0 mode of a cy- lindrical cavity filled with a plasma column in the center are deduced based on the analytic method in this paper. It is studied in detail that the resonant frequency and the electromagnetic field distribution of the TMo^0 mode and the TM0eo mode changes with the plasma frequency of the electron beam. The research results show that the resonant frequency of the TM010 mode and the TM0z0 mode will increase with the increasing of the plasma frequency of the electron beam, and the distribution of the electromagnetic fields also changes. When the electron beam＇s plasma frequency exceeds the resonant frequency of the cavity, the electromagnetic field distribution of the TM010 mode and the TM020 mode in the cylindrical cavity will change greatly, and some peculiar phenome- na will appear, such as the electric field inside the electron beam will be in the opposite direction of the electric field outside the electron beam, the electromagnetic field will be converged on the brim of the electron beam, and so on.

关 键 词：谐振腔 电子注 等离子体 等离子频率 谐振模式 

分 类 号：TN12[电子电信—物理电子学]