等离子体诊断由于其持续时间为皮秒量级, 故要求在X射线条纹相机单次测量过程中尽可能多地获取信息, 其中一个有效的途径是增大其成像面积。为了解决大物面成像质量问题, 基于二电极同心球静电聚焦系统, 设计了一种大物面X射线条纹管。通过蒙特卡罗法仿真电子发射和龙格-库塔法追踪电子轨迹, 计算得到该管型阴极有效工作面积直径为50 mm, 中心静态极限空间分辨率可达50 lp/mm, 边沿静态极限空间分辨率31 lp/mm, 放大倍率为1.1, 整管长度600 mm, 管径100 mm。结果显示, 该条纹管满足大物面成像的要求, 可用于超快事件过程中大量信息的获取。

X-ray streak camera is requested to obtain as much information as possible in single measurement because of the picoseconds duration in plasmas diagnosis. An effective method is to enlarge the imaging area. An X-ray streak tube is designed based on the electrostatic focusing system of bi-electrode concentric sphere to solve the problem of imaging quality for large format. Through simulation of the electrons emission by Monte Carol methods and tracing the electron trajectories by Runge-Kutta, the calculation shows that the effective working area of photocathode is 50 mm, central static limit spatial resolution is 50 lp/mm, edge static limit spatial resolution is 31 lp/mm, the magnification is 1.1, the length is 600 mm, and the diameter is 100 mm. The results show that it can satisfy the requirement of large format imaging and can be applied in the process of ultrafast event to obtain lots of information.