示踪材料在内爆X光诊断过程中的作用
Effects of tracer in fuel on X-ray diagnostics of implosion
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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0.05 μm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。
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关键词:
- 激光聚变 /
- 内爆 /
- 示踪元素 /
- 燃料界面 /
- X光诊断Key words: laser fusion /
- implosion /
- tracer /
- fuel boundary /
- X-ray diagnostics
Abstract: 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 -
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