L-Shell Radiation Opacity Of Low Ionization Iron,Nickel,Copper Plasmas

Plasma radiation opacity characterizes the light absorption characteristics of plasma,and has very important applications in astrophysics,inertial confinement fusion(ICF)and other research fields.The radiation opacity of iron(Fe,Z=26),nickel(Ni,Z=28)and copper(Cu,Z=29)bodies is of great significance to the modeling and evolution of solar like stars and cold stars.In this paper,a hybrid detailed energy level(DLA)model is developed to calculate the L-shell opacity of medium Z-element plasma with open M-shell.The specific work is as follows:1.A hybrid DLA model method is developed in this paper:for the absorption lines with low initial transition energy,the transition parameters are obtained by configuration interaction(CI)method;For the absorption lines with high initial transition energy,the transition parameters are obtained by single configuration(SC)method.The model balances the calculation accuracy and time,and can be easily applied to the calculation of radiation opacity of plasma with complex electronic structure with open m shell.2.The radiation opacity calculated by the hybrid model in this paper is compared with the experimental data.Compared with other statistical models,the method in this paper is in better agreement with the experimental data,which shows the accuracy of this method.Based on the method developed in this paper,the temperature diagnosis of relevant experimental plasma states can be carried out.3.The L-shell radiation opacity of Fe,Ni and Cu plasmas in a wide range of temperature and density(T～10-30 eV,ρ～0.001 g/cm~3-0.1 g/cm~3)is systematically studied.The sensitivity of L-shell radiation opacity to temperature and density is systematically studied,and the characteristics of spectral"bimodal"structure caused by relativistic splitting of spin orbit in 2p-3d transition are explored.