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惯性约束聚变内爆物理研究中,示踪元素X光谱线诊断方法是推测内爆压缩温度、密度以及燃料混合的有效办法,因此,对示踪元素X光发射的规律及其与内爆过程的关系的研究非常必要,有助于通过谱线发射特征诊断内爆状态.以SGIII原型装置的实验条件下的内爆过程为例,对内爆靶丸示踪元素Ar发射X光谱线进行了理论模拟.研究了谱线自吸收效应、Ar掺杂浓度、等离子体空间分布不均匀等对Ar发射的X光谱线分布的影响.还对Ar发射X光谱线强度的时间演化及其与内爆过程的关系进行了研究.结果表明,增加掺杂浓度,谱线强度增强,但是谱线自吸收效应的影响也明显增强.示踪元素Ar发射的X光谱线强度的峰值时刻与中子产生速率的峰值时刻接近(前者延迟约15 ps).高温、高密度及合适的电离度是谱线发射的3个条件,在X光谱线发射的峰值时刻,由于燃料芯部Ar等离子体过电离,Ar等离子体发射的X光谱线的空间峰值区域靠近燃料边界区域,占燃料总体积56%的薄壳(厚度～4μm),其发射的X光谱线强度约为总强度的72%.因此,对发射谱线分布拟合得到的空间平均的等离子体温度、密度主要反映这一区域的等离子体状态.
In inertial confinement fusion implosion physics, the method of X-ray tracing of trace elements is an effective way to infer the compression temperature, density and fuel mixture of implosion. Therefore, the regularity of X-ray emission of tracer element and its implosion It is very necessary to study the relationship between the implosion state and the implosion state through the emission characteristics of the line.The theory of the Ar emission X-ray spectrum of the implanted target pill tracer element has been studied by using the implosion process under the experimental conditions of the SGIII prototype device The influence of the self-absorption effect of the line, the Ar doping concentration and the nonuniform plasma distribution on the X-ray emission distribution of Ar emission was studied.The temporal evolution of the X-ray emission intensity of Ar emission and its relationship with the implosion process The results show that with the increase of doping concentration, the intensity of the line increases, but the effect of the self-absorption of the line also increases obviously.The peak moment of the X-ray line intensity of the tracer element Ar and the neutron production rate Peak time close to the former (about 15 ps delay) .High temperature, high density and the appropriate degree of ionization are the three conditions of the emission line, at the peak of the X-ray emission line due to the fuel core Ar plasma over-ionization, The X-ray line emitted by Ar plasmas has a spatially peaked region close to the fuel boundary region, which accounts for 56% of the total volume of the fuel (thickness ~ 4 μm) and emits an X-ray line at about 72% of the total intensity. The average plasma temperature, which is obtained by fitting the emission line distribution, mainly reflects the plasma state in this area.