双示踪元素X射线能谱诊断激光等离子体电子温度

在“星光Ⅱ”激光装置上对Mg/Al混合材料平面靶和Mg/Al示踪层金盘靶进行三倍频激光打靶实验,用平面晶体谱仪测量靶材料发射的X射线能谱,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混合材料平面靶及金盘靶激光等离子体的电子温度 关键词： 电子温度 激光等离子体 X射线能谱

DETERMINATION OF ELECTRON TEMPERATURE IN LASER-PRODUCED PLASMAS BY ISOELECTRONIC XRAY SPECTROSCOPY

Experiments were performed to determine the electron temperatures of Mg/Al disk target and gold disk target mixed with tracing Mg/Al materials irradiated by laser beams at a wavelength of 0.35μm from the “Xing Guang Ⅱ”high-power laser facility.X-ray spectra from the targets were measured by a 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 two tracing ions in laser-produced plasmas with the electron temperature were derived according to local-thermodynamic-equilibrium model.Based on the above-mentioned experiment the electron temperatures of the plasmas generated by focusing laser pulse on the targets were determined via isoelectronic line ratios.