Study On The Particles Population And Spectra Of Xenon And Gold Plasmas Using Detailed-Level-Accounting Model

For plasmas in non-local thermodynamics equilibrium(non-LTE),the population distribution among different charge states is essential for studying emission and absorption spectra of plasmas,which is very useful in inertia confined fusion(ICF),astrophysics,X-ray laser and other fields.In this work,the abundance distribution of Xe and Au plasmas is investigated and then were utilized to simulate emission and absorption spectra using a detailed level accounting(DLA) model.Atomic data of physical processes which are relevant to non-LTE plasmas were investigated in detail.Atomic data,including electron impact excitation collision strength, photoionization cross section and electron collision ionization cross section were calculated using configuration interaction and distorted-wave approximation method.With these atomic data,the rate coefficients of photon excitation and decay excitation,electron collision excitation and de-excitation,photon ionization and radiative recombination,electron collision ionization and recombination,autoionization and dielectronic capture were obtained.All these rate coefficients are used to solve the coupled rate equation.In order to solve the population among different charge stated in plasmas,physical models were developed for plasmas in LTE,coronal equilibrium and general non-LTE conditions.First, the population distribution of xenon plasmas,which have strong emission at extreme ultraviolet (EUV) region in LTE and coronal equilibrium were determined by solving Saha and coronal ionization equilibrium equations respectively.The favorable plasma temperature of xenon plasmas for EUV emission is infered.Second,a physical model is developed tho solve population of levels in coronal equilibrium condition and then the EUV emission spectra of Xe¹⁰⁺ is simulated at a variant of temperatures.The simulated spectra agree well with the experimental and other theoretical results.Third,a general non-LTE model is developed to calculate the population distribution of gold plasma by solving a completely coupled rate eqution using a DLA formalism,which includes various atomic processes of ionization and recombination,excitation and decay-excitation.Combined with the atomic data,absorption spectra of gold plasma were simulated.