摘要
激光聚变内爆实验中,在燃料中掺杂少量比例的中高Z材料,用X光光谱和X光成像测量掺杂元素的发射信息,诊断燃料的温度、密度和压缩形状。用辐射流体力学数值计算和X光成像后处理程序综合分析方法,给出了内爆靶丸优化设计,并讨论示踪材料在X光诊断中的作用。结果表明:在靶丸燃料D2中掺原子分数约1.0%的氩,内爆压缩中子产额下降约15%。由于氩线发射使整个燃料区X光发射强度提高约50倍,X光成像区域增大约30%,有利于实验诊断测量燃料芯部。为了测量燃料区的边界,在CH内壳层涂厚度0.05μm的硫,分析表明硫Ly-α单能成像大小与流体力学计算的燃料区大小一致,可用于诊断燃料最终压缩界面。数值分析结果得到了神光Ⅱ间接驱动内爆物理相关实验的验证。
Diagnosing conditions of compressed fuel is a critical aspect of ICF capsule implosion experiments.A common diagnostic technique is to add a small concentration of high-or mid-Z dopant to the fuel,and measure the emission from the dopant either spectroscopically or by imaging.With radiative hydrodynamic simulations and post-processing of X-ray imaging for implosions,the designs of the fuel capsule are optimized,and the effects of tracer in fuel on X-ray diagnostics of implosion are analyzed.The results show that for the capsule of D2 fuel doped with argon at about 1% atomic fraction,although the implosion yield reduces by about 15%,the X-ray intensity of fuel increases by 50 times and the size of X-ray imaging is enlarged by about 30%,which is beneficial to the diagnosis of the fuel core.For the capsule with 0.05 μm thick sulfur coated inside the CH shell,the dimensions of sulfur Ly-α monochromatic X-ray imaging accord with those of the fuel region,and thus the compressed boundary of fuel can be deduced.Above analysis results have been validated by Shenguang Ⅱ implosion experiments.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2011年第3期693-696,共4页
High Power Laser and Particle Beams
基金
国家自然科学基金项目(10975025)
计算物理实验室基金项目
国家高技术发展计划项目
