等电子谱线法测量Mg/Al等离子体电子温度空间分布
Observation on spatial character of plasmas electron temperature for Mg/Al dotted targets by isoelectronic line ratios
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摘要: 在“星光Ⅱ”激光装置上对Mg/Al混合材料埋点靶进行三倍频激光打靶实验，用空间分辨晶体谱仪测量靶材料发射的X光光谱，获取了示踪离子谱线实验数据。采用多组态Dirac-Fock方法计算所需原子参数，并在局域热动平衡条件下建立了双示踪离子谱线强度比随电子温度的变化关系。在此基础上由双示踪元素等电子谱线法确定了Mg/Al混合材料埋点靶激光等离子体电子温度空间分布。Abstract: The experiments were performed to determine the profile of electron temperature in Mg/Al dotted target irradiated by laser beams at wavelength of 0.35μm from the “Xing Guang Ⅱ” laser facility. X-ray spectra from the target were measured by a spatially resolved crystal spectrometer. The technique of multi-configuration Dirac-Fock was used to calculate relevant atomic parameters. Variations of relative intensity of isoelectronic lines from the double tracing materials in laser-produced plasmas with electron temperature were derived according to local-thermodynamic-equilibrium model. And, the spatial character of electron temperature in plasmas was determined via isoelectronic spectral line intensity ratios.
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