光学学报, 2015, 35 (11): 1134001, 网络出版: 2015-11-03
一种新型加速结构飞秒条纹相机的设计
Designment of a Femtosecond Streak Camera with a Novel Accelerating Structure
超快光学 飞秒现象 条纹相机 Monte Carlo模拟 加速结构 空间电荷效应 调制传递函数 ultrafast optics femtosecond phenomena streak camera Monte Carlo simulation accelerating structure space charge effect modulation transfer function
摘要
为提高飞秒条纹相机的性能,设计了一种新型加速结构的条纹相机,它具有加速栅网和加速狭缝通道,平行平板电极结构。考虑实际惯性约束核聚变(ICF)实验中X 射线入射CsI光阴极,光电子能量弥散较大和空间电荷效应作用下,用蒙特卡罗方法抽样2000个光电子能量角度分布值,用四阶龙格-库塔法计算了电子在条纹相机中的飞行轨迹。在成像面上统计电子时空分布得到该条纹相机的时间和空间分辨特性,结果显示使用该加速结构的飞秒条纹相机空间分辨率达到21l lp/mm,时间分辨率达到508.4 fs,对比传统平行平板相机,分别提高了90%和29%左右,性能提高明显。该新型条纹相机加速结构简单,具有实用性。
Abstract
To improve the performance of the femtosecond streak camera, a novel accelerating structure is designed and applied to streak camera with accelerating mesh and slit channel, parallel plate electrodes. Considering X-ray incident on CsI photocathode in actual inertial confinement fusion(ICF) experiment, large photoelectron energy dispersion and the space charge effect, 2000 photoelectrons’energy and angular are sampled with Monte Carlo simulation, their trajectories are calculated with the fourth-order Runge Kutta method. Time and space resolution of streak camera with this novel accelerating structure are obtained by analyzing electron time and space distribution on the imaging surface, and the result shows that time resolution is up to 508.4fs and space resolution is up to 21l lp/mm. Compared to the traditional parallel plate electrode streak camera, the time and space resolution are significantly improved by 90% and 29% respectively. The novel accelerating structure of the streak camera is simple and practical.
顾礼, 宗方轲, 李翔, 张敬金, 张驰, 杨勤劳. 一种新型加速结构飞秒条纹相机的设计[J]. 光学学报, 2015, 35(11): 1134001. Gu Li, Zong Fangke, Li Xiang, hang Jingjin, Zhang Chi, Yang Qinlao. Designment of a Femtosecond Streak Camera with a Novel Accelerating Structure[J]. Acta Optica Sinica, 2015, 35(11): 1134001.