摘要
为获得能够实际应用的飞秒时间分辨软X射线变像管,提出并完成了一种新的扫描变像管管型的理论设计。新管型采用五电极平面对称静电柱透镜,它易于对电子束进行强聚焦,且没有轴对称透镜的电子束聚焦交叉点,由此可以缩短变像管长度,减小渡越时间弥散和抑制空间电荷效应,从而提高动态范围和时间分辨率。通过模拟计算得到:在光电子初能量色散半高宽为1.6eV、狭缝面积为10mm×20μm、时间分辨能力为500fs时,软X射线变像管有用的动态范围约100倍。
The research of inertial confinement fusion demands a streak image tube with femtosecond temporal resolution and large dynamic range.In order to obtain a setup in the practical application,a novel soft X-ray streak image tube was proposed and designed.A planar symmetric electrostatic cylindrical lens with five electrodes was introduced into the image tube model,which has a strong ability to focus the electron beam,and has no cross-over effects as in the axial-symmetrical system.The cylindrical lens can shorten the length of image tube,reduce the transit time dispersion,and restrain space charge effects,thus enlarging the dynamic range and improving the temporal resolution.The simulation results show that if the photoelectron＇s initial energy spread is 1.6 eV,and the slit area is 10 mm×20 μm,the useful dynamic range of 100 is obtained with 500 fs temporal resolution.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2011年第10期2683-2686,共4页
High Power Laser and Particle Beams
基金
国家高技术发展计划项目
关键词
X射线
变像管
动态范围
时间分辨
诊断
X-ray
image tube
dynamic range
temporal resolution
diagnosis
