神光-Ⅲ汤姆孙散射诊断的集光系统设计  

Design of Collective Optic System for Thomson Scattering Measurements on Shenguang-Ⅲ Facility

作　　者：闫亚东[1] 卢卫涛[1,2] 董晓娜[1] 何俊华[1] 刘西站[1] 张敏[1] 张彭舜[1] 

机构地区：[1]中国科学院西安光学精密机械研究所,陕西西安710119 [2]中国科学院研究生院,北京100049

出　　处：《光学学报》2011年第6期62-66,共5页Acta Optica Sinica

基　　金：西部博士基金(200929441213)资助课题

摘　　要：设计了应用于神光-Ⅲ装置的汤姆孙散射光收集系统。采用折反式双卡塞格林结构,实现了在有限口径内长距离的像传递,解决了紫外透射材料选择困难的问题。通过纠正镜的优化设计,使超长焦距透镜的加工、检测简化。通过选择适当的中间像面的放大倍率,降低了次反射镜的遮光比。通过在一次像面附近增设透射光学元件,实现了两组光学系统的有效耦合。在中间像面设置十字分划板方便了系统安装瞄准操作。系统总长5 m,最大元件口径190 mm,视场范围2 mm,放大倍率为1.5,物方F数为10,物方分辨率优于20μm。A Thomson scattering signal collective optic system is designed for Thomson scattering measurements on Shenguang-Ill facility. The optical system is composed of two coupled Cassegrain systems, and has an intermediate image plane. This configuration makes the optical path length long enough to transmit the scattering signal to the camera outside the target chamber. The catadioptric system makes it easier to balance chromatic aberration as there are few ultraviolet materials available. The corrector lens which has a long focal length is replaced by two faster corrector lenses, which make the fabrications and measurements easier. The obscuration ratio is reduced by choosing a proper intermediate magnification. The two refraction lenses beside the intermediate image plane help to couple the two systems well. A reticle is set at the intermediate image plane for system aiming and can be removed before event recording. This system has the total length of more than 5 m, with the maximal elements diameter of 190mm. The field of view is 2 mm, the magnification is 1.5, and the object space F-number is 10, and the resolution is better than 20 μm.

关 键 词：成像系统 汤姆孙散射 卡塞格林 光学系统设计 遮光率 

分 类 号：TH744.3[机械工程—光学工程] TH824[机械工程—仪器科学与技术]