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提出一种测量金激光等离子体电荷态分布与平均电离度的X射线光谱学诊断方法。该方法基于稳态碰撞-辐射近似,考虑电子离子直接碰撞激发与双电子复合两种激发态布居方式,建立了金M带5f-3d跃迁组辐射总强度与离子态分布的耦合方程。根据实验测量的金平面靶激光等离子体冕区辐射的5f-3d跃迁线系的强度分布,诊断得到了金激光等离子体的电荷态分布与平均电离度。此外,还分析了电子温度、电子密度以及双电子复合过程对电荷态分布及平均电离度诊断的影响,并将实验诊断结果与辐射流体力学理论模拟结果及离化平衡动力学计算结果进行了对比分析。结果表明:实验诊断结果与基于CRE近似的离化平衡动力学计算结果近似;当电子温度高于1.5 keV时,双电子复合过程对电离度的诊断结果影响较小。
An X-ray spectroscopy method for the determination of charge state distribution and average ionization of gold laser plasma is proposed. Based on the steady-state collision-radiation approximations, the coupling equations between the distributions of the total radiation intensity and the ionic states in the 5f-3d transition of gold M band are established considering the two kinds of excited states of direct ion collisions and double-electron recombination. The charge distribution and average ionization of Au laser plasma were diagnosed according to the intensity distribution of the 5f-3d transition lines measured by the experimentally measured laser plasma corona radiation. In addition, the effects of electron temperature, electron density and double-electron recombination process on charge state distribution and average ionization degree were analyzed. The experimental diagnosis results were compared with the theoretical results of the radiation hydrodynamics and the results of ionization equilibrium kinetics analysis. The results show that the results of the experimental diagnosis are similar to those of ionization equilibrium kinetics based on the CRE approximation. When the electron temperature is higher than 1.5 keV, the double-electron recombination process has little effect on the diagnosis of ionization degree.