条纹管行波偏转特性  

Travelling Wave Deflecting Characteristics of Streak-tube

作　　者：李昊[1,2] 田进寿[2] 李岩[3] 王超[1] 温文龙[1] 王俊锋[1] 王兴超[1] 

机构地区：[1]中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室,西安710119 [2]中国科学院大学,北京100049 [3]西安石油大学,西安710065

出　　处：《光子学报》2013年第7期792-796,共5页Acta Photonica Sinica

基　　金：国家重大科研装备项目(高性能条纹相机的研制);国家自然科学青年基金项目(No.60901036)资助

摘　　要：为了获得有宽频带、小色散、高偏转灵敏度的偏转器件,设计了一种行波偏转板.用商业电磁模拟软件CST频域有限元法研究了条纹相机行波偏转板的通频带宽,用时域有限积分法研究了行波偏转板色散曲线、特性阻抗随频率变化曲线以及对电子束的偏转特性.对行波偏转板和传统平板偏转器的偏转灵敏度进行了对比.模拟了正弦扫描电压信号下行波偏转板中的电场分布.结果表明:尖头形偏转板的通频带宽大于圆头形偏转板通频带,且通频带宽随管脚长度增加会变窄,最大通频带宽为7GHz;行波偏转板的相速度和群速度会随频率的增大而减小,且随着频率的增加,特性阻抗会出现一个峰值;相同尺寸行波偏转板比平行板结构偏转板对电子束的偏转灵敏度高两倍以上;正弦扫描电压在板间产生的电场呈周期性,行波偏转板有较宽的通频带,在较宽的频带内色散小,可以有效使电子束发生偏转.In order to obtain deflection device having wide bandwidth, small dispersion and high deflection sensitivity, a kind of traveling wave deflector is designed. Using commercial electromagnetic simulation software CST finite element method, bandwidth of traveling wave deflector in streak camera is studied, and the travelling wave deflector characteristics of dispersion curves, characteristic impedance changing with frequency and electron beam deflecting function are studied numerically using finite integration method. The comparison of deflecting sensitivity between traveling wave deflector and traditional plating deflector is made. Moreover, the electric field distribution in traveling wave deflector with sinewave scanning voltage signal is simulated. The results show that bandwidth of sharp top deflector is bigger than that of round top deflector and that bandwidth becomes smaller when legs of deflector become longer, with the biggest bandwidth of 7 GHz; phase velocity and group velocity decrease with the increasing of frequency; when frequency increases, a peak value exists for characteristic impedance; under the same dimensions, the deflecting sensitivity of travelling wave detector is two times higher than that of plating deflector; the electric field produced by sinewave scanning voltage appears periodic; the designed traveling wave deflector has wide bandwidth, of which dispersion is small in wide frequency range, and it can effectively make electron beam deflect.

关 键 词：行波偏转板 通频带宽 特性阻抗 慢波结构 色散关系 

分 类 号：O463[机械工程—光学工程] TN16[理学—电子物理学]