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气体切伦科夫探测器是惯性约束聚变的重要诊断设备,可用于聚变反应历程的测量。基于探测器的测量原理,并针对传统卡塞格林光学系统的不足,分析了一种新型气体切伦科夫探测器的光学结构,采用3片90°离轴抛物镜和1片平面反射镜组成的离轴光学系统,将探测窗口置于光学系统的出瞳位置,可减小同轴系统的缺陷提高光收集效率;利用多次反射镜反射增加光程,实现干扰信号分离。分析了光学系统的光束限制和光线追迹结果,比较了离轴系统与传统同轴系统的光收集效率。结果表明,离轴光学系统的光学效率为8.3%,同轴光学系统的效率为0.5%。
The gas Cherenkov detector is an important diagnostic device for inertial confinement fusion and can be used for the measurement of fusion reaction history. Based on the measurement principle of the detector and aiming at the shortcomings of the traditional Cassegrain optical system, the optical structure of a new type of gas Cherenkov detector is analyzed, which consists of three 90 ° off-axis parabolic mirrors and one plane mirror Of the off-axis optical system, the detection window is placed at the exit pupil of the optical system can reduce the defects of the coaxial system to improve the light collection efficiency; the use of multiple reflection mirror to increase the optical path to achieve interference signal separation. The optical beam limiting and ray tracing results are analyzed, and the light collecting efficiency of the off-axis system and the traditional coaxial system is compared. The results show that the optical efficiency of the off-axis optical system is 8.3% and that of the coaxial optical system is 0.5%.