脉冲展宽分幅变像管色差特性分析  

Characteristic Analysis of Chromatic Aberration of Pulse-dilation Framing Tube

作　　者：雷云飞[1] 刘进元[1] 蔡厚智[1] 黄峻堃 王勇[1] 邓珀昆 LEI Yunfei;LIU Jinyuan;CAI Houzhi;HUANG Junkun;WANG Yong;DENG Pokun(College of Physics and Optoelectronic Engineering,Shenzhen University,Shenzhen,Guangdong 518060,China)

机构地区：[1]深圳大学物理与光电工程学院,广东深圳518060

出　　处：《光子学报》2021年第8期214-221,共8页Acta Photonica Sinica

基　　金：国家自然科学基金(No.11775147),中国博士后科学基金(No.2018M643183)。

摘　　要：提出了一种短磁透镜成像的脉冲展宽分幅变像管,变像管阴极加载偏置−3000 V直流电压和斜率为10 V/ps的斜坡电脉冲,斜坡脉冲使阴栅间加速电压发生变化,进而引入了与脉冲斜率成正比的额外色差,对该色差特性进行了分析。仿真结果表明,在色差作用下,不考虑电子图像时间长度,瞬态轴上空间分辨率在20 ps内从约60 lp/mm下降至约2 lp/mm;考虑电子图像时间长度后,电子图像的空间分辨率在20 ps内从约10 lp/mm下降至约2 lp/mm。根据仿真模型搭建了实验平台,实验结果表明,当阴极电压从−3000 V变化至−2860 V时,2.5 lp/mm分划板的图像调制度下降约为10%。A pulse-dilation framing tube with magnetic lenses was developed,the photocathode biased at−3000 V was loaded with 10 V/ps oblique pulse.The pulse changed the accelerating voltage between the cathode and the anode,then the additional chromatic aberration which is proportional to the pulse slope was caused.The chromatic aberration characteristics of this tube were analyzed.The simulation results show that the spatial resolution on the axis decreases from about 60 lp/mm to about 2 lp/mm in 20 ps with ignore the time length of the electronic image;otherwise,the duration of the image is included,the spatial resolution on the axis decreases from about 20 lp/mm to about 2 lp/mm in 20 ps.The experimental setup is built according to the simulation,and the experimental results show that the modulation of the 2.5 lp/mm resolution mask declines 10%when the accelerating voltage decreases from−3000 V to−2860 V.

关 键 词：超快诊断 分幅变像管 脉冲展宽技术 色差 空间分辨率 短磁聚焦 

分 类 号：TN143[电子电信—物理电子学] TN16