定向红外光空间分布误差对冷冻靶温度场的影响分析  

Analysis of influence of spatial distribution error of directional infrared light on temperature field of cryogenic targets

作　　者：郭富城 李翠[1] 厉彦忠[1] Guo Fu-Cheng;Li Cui;Li Yan-Zhong(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《物理学报》2022年第11期86-98,共13页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:52176021)资助的课题。

摘　　要：在惯性约束核聚变中,决定点火成功与否的关键因素在于靶丸内燃料冰层的均匀性,而影响靶丸内燃料冰层均匀性的主要因素为靶丸温度场均匀性.为了提升靶丸温度场均匀性,采用定向红外辅助均化装置实现对靶丸表面温度场的局部调控.在定向红外装置的运行过程中,红外光空间分布误差会影响到靶丸温度场的调控效果.建立了定向红外光线追踪与温度场计算耦合的数值模型,并与实验进行对照分析,确定了数值模型良好的计算精度.采用三维的冷冻靶物理模型,研究了不同形式的定向红外光空间分布误差对靶丸温度场的影响规律.结果表明:光轴偏心对靶丸温度场均匀性的影响最为剧烈,光带间距变化的影响次之,光带宽度的变化对靶丸温度场均匀性的影响最小.在实验中应当尽可能避免南北两侧光带光轴的偏心,从而保证靶丸表面温度均匀性,进而可以保证靶丸内燃料冰层的均匀性.For an inertial-confinement-fusion cryogenic target,the fusion ice layer inside the capsule should have a uniformity more than 99%and an inner surface roughness less than 1μm(root mean square)to avoid Rayleigh-Taylor instabilities.And this highly smooth ice layer required for ignition is generated in the presence of volumetric heat and affected by the thermal environment around the capsule.For the D_(2) fuel targets,the uniformity of the fusion ice layer inside the capsule is consistent with the uniformity of the surface temperature around the capsule,and the latter can be controlled by directional infrared illumination.A major challenge of directional infrared illumination is the precision of directional infrared spatial distribution.In this paper,a numerical model coupling the directional infrared tracking and temperature field calculation is proposed and validated by experimental results.A three-dimensional physical model of the cryogenic target is used to study the influences of different forms of directional infrared spatial distribution errors on the temperature uniformity of the capsule.The results show that the eccentricity of IR band axis has the worst effect on the temperature uniformity of the capsule,followed by the distance between both IR bands,and the width of the IR band has the least effect on the temperature uniformity of the capsule.Therefore,the eccentricity of IR band axis should be avoided in experiment to ensure the uniformity of the temperature of the capsule,further ensuring the uniformity of the fuel ice layer inside the capsule.

关 键 词：惯性约束核聚变 定向红外 空间分布误差 数值模拟 

分 类 号：TL632[核科学技术—核技术及应用]