基于光纤光源的积分球内氘氘冰层红外均化设计  

Design of Integrating Sphere to Forming Uniform DD Layers with Infrared Optical Fiber Source

作　　者：代飞[1] 王凯[1] 林伟[1] 黎军[1] 陈冠华 雷海乐[1] 陶朝友 DAI Fei;WANG Kai;LIN Wei;LI Jun;CHEN Guanhua;LEI Haile;TAO Chaoyou(Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang 621000,Sichuan,China)

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621000

出　　处：《真空与低温》2024年第3期318-324,共7页Vacuum and Cryogenics

基　　金：国家自然科学基金(11674291、12175208)。

摘　　要：惯性约束聚变实验要求低温靶的冰层均匀性小于1μm。针对高均匀全固态氘氘冰层均化时缺乏β衰变热的问题,提出了基于光纤光源照明的积分球红外光均化方案。采用光线追迹耦合温度场的仿真技术,数值研究了光源位置以及入射角度对低温靶温度场的影响规律。研究结果表明,当红外光源功率为2.25 mW,入射位置Z=-7.3 mm,水平旋转角度为157.5°,冰层平均体加热率为24000 W/m3时,能够使冰层内表面最大温差满足0.1 mK的要求,满足冰层均化所需的温度场要求。本研究为后续进行基于积分球系统的红外均化低温靶制备实验提供了理论指导。Inertial confinement fusion experiment requires the ice layer uniformity of cryogenic target to be less than 1μm to avoid Rayleigh-Taylor instabilities.For the lack of heating source generated by beta decay of tritium which can force the ice redistribute itself inside the capsule so that the inner ice surface is isothermal,an integrating sphere to forming uniform DD layers with infrared optical fiber source is proposed.The influence of light source position and incidence angle on the temperature field of the cryotarget is numerically studied by coupling the ray tracing and thermal fields.The results indicate that when the power of the infrared light source is 2.25 mW,the incident position is Z=-7.3 mm,the horizontal rotation angle is 157.5°,and the average body heating rate of the ice layer is 24000 W/m3,the temperature homogeneity of the DD inner surface can meet the requirements of 0.1 mK and achieve the temperature field required for forming uniform DD layers.This study provides theoretical guidance for further experiment of forming uniform DD layers in integrating sphere using infrared radiation.

关 键 词：惯性约束聚变 低温靶 红外均化 

分 类 号：TL64[核科学技术—核技术及应用]