第20卷第11期 2012年11月
文章编号
1004924X(2012)11-238906
光学精密工程
Optics and Precision Engineering
聚变反应速率测量光学系统设计
闻闫亚东*，何俊华
（中国科学院西安光学精密机械研究所，陕西西安710119）
Vol. 20No.11
Nov,2012
摘要：基于塑料闪烁体和条纹相机设计了变反应速率测量系统，论述了测量光学系统的工作原理和设计方法。通过设置防辐射石英玻璃窗，防止了光学元件受强X射线辐射而变暗；采用晶体等紫外透过率高的光学材料，满足了光学系统对透过率的要求；光学系统像面与条纹相机的阴极面直接对接，解决了条纹相机孔径不匹配的间题；最后在一次像面设置场镜，大幅编小了光学元件的口径。设计的光学系绕总长为2660mm，放大倍率为1/3，像方F/#数达到0.667，系统透过率达到67%，时间弥散小于7.3ps这些结果能够适应不同中子产额的实验需求，在激光打靶实验中取得了较好的实验效果。
关键词：聚变反应速率；反应速率测量；中于；光学设计；时间弥散
中图分类号：TL62：TH703
文献标识码：A
doi;10.3788/OPE,20122011.2389
Designofopticalsystemforfusionreaction-ratemeasurement
YANYa-dong'，HEJun-hua
(Xi'anInstituteof OpticsandPrecisionMechanics, ChineseAcademyof Sciences，Xi'an710119,China)*Correspondingauthor,E-mailyyd@opt.ac.cn
Abstract: Based on a plastic scintillator and an optic streak camera, a measuring system for fusion re action-rate was designed, then the working princile and design method of the measuring system were addressed in detail. A piece of fused silica window was set just behind the plastic scinitillator to protect optical elements from darkening after a long time exposure in scatted X rays and the ultraviolet crys-tals and other ultraviolet glass were selected to ensure the high system transmission. Furthermore, the image plane of the optical system was put onto a photocathode of the streak camera directly to re move the aperture non-matching of input optic system of the streak camera. Finally, a field mirror was put on the first image plane to reduce the max diameter of optical element from 160 mm to 120 mm.The designed optical system has a total length of 2 66o mm, magnification of 3 : 1 and its final lens is F/0.667 and transmission is 67%.Moreover,the time dispersion of the optical system is less than 7. 3 ps. These results meet the experimental needs of different neutron yields and good experi-mental results have been obtained in a laser targeting experiment.
Key words: fusion reaction-rate; reaction rate measurement; neutron; optical design; temporal disper-
sion
收稿日期：2012-07-04；修订日期：2012-09-25
基金项目：国家教育部博士点（西部）基金资助项目（No.200929441213）