同步扫描管时空分辨特性研究(英文)

Spatio-temporal Resolution Studies on a Synchronous Streak Tube

设计了一种具有高空间分辨率、高时间分辨率和大工作面积的同步扫描条纹管.建立三维模型,系统地分析了物理时间分辨率与加速电压、空间分辨率与偏转系统-光电阴极的距离、动态空间分辨率和时间分辨率与扫描速度的关系.给出最优化结构参数和电气参数:d_(DC)=100 mm,U_(g)=700 V,T_(screen)=0.5 ns.数值模拟结果表明,在光电阴极有效工作面积18 mm×2 mm范围内,静态和动态空间分辨率分别高于25 lp/mm@MTF=10%和16 lp/mm@MTF=10%.在T_(screen)=0.5 ns时,同步条纹管的时间分辨率优于5.6 ps.此外,实验测试得到在400 nm波长处,光电阴极的辐射灵敏度为51 mA/W,光电阴极有效面积内的静态空间分辨率高于25 lp/mm@CTF=13%.

A synchronous streak tube capable of providing high spatial resolution,high temporal resolution and large working area is numerically designed and experimentally demonstrated.In this paper,a 3-D model developed to systematically and comprehensively analyze the dependence of the physical temporal resolution on the accelerating voltage,the spatial resolution on the deflector-to-cathode distance,the dynamic spatial resolution and temporal resolution on the scanning velocity.Finally,geometry and electric parameters of d_(DC)=100 mm,U_(g)=700 V,and T_(screen)=0.5 ns are proposed to optimize the streak tube performances.The numerical simulations show that the static spatial resolution is higher than 25 lp/mm@MTF=10%and the dynamic spatial resolution is higher than 16 lp/mm@MTF=10%over the whole effective photocathode area of 18 mm×2 mm.And,the simulated temporal resolution is better than 5.6 ps at Tscreen=0.5 ns.Furthermore,the photocathode radiant sensitivity can reach 51 mA/W at the wavelength of 400 nm.The tested static spatial resolution is as high as 25 lp/mm@CTF=13%.