Theoretical Studies On Electron Density And Opacity Of Non-Ideal Argon Plasma

The studies on electron density and opacity of non-ideal plasma have increased recently owing to the development of modern technical projects and facilities. Some results about non-ideal plasma have been obtained from experiment, but the theoretical research is fairly fewer. The reason is that within non-ideal plasma, the interparticle interaction is strong, and the interaction has influence enough to the plasma. Therefore, the influence of interparticle interaction must be considered reasonably when we study problems about non-ideal plasma. However, it is so hard to set up theoretical model of interparticle interaction in non-ideal plasma for the varied and complicated interaction. At present, main information comes from experiment. Obviously, it is important that electron density and opacity of non-ideal plasma are studied by theoretical method, and the theoretical models about non-ideal plasma are set up.This paper studies the electron density and opacity of non-ideal argon plasma, calculates their results under the temperature T~2.0eV-l.0eV and the density of plasma p~0.001g/cm3-3.0g/cm\ and researches the interparticle interaction influence to electro density and opacity. These theoretical results are useful to realize the new field.Firstly, we analysis the conditions which suitable for those four theoretical models, and find out whither or not these models are reasonable to calculate electron density and opacity of non-ideal plasma.Based on the average atom model in local-thermodynamic-equilibrium (LTEmodel), we calculate electron density in non-ideal argon plasma by using the screened hydrogenic model (shortly as SHM model), where the temperature T~2.0eV and density of plasma p~0.001g/cm3-0.5g/cm3.However, to weekly non-ideal plasma, electron densities calculated by using SHM model are not satisfactory. To solve this problem, we introduce the average-ion conception into the Debye-Huckle model, and obtain the average-ion Debye model.We replace the ion-sphere model in screened hydrogens (SHM) by the average-ion Debye model. Using the average-ion Debye model, we calculate electron densities of non-ideal argon plasma under temperature T~2.0eV and density p~0.001g/cm3-0.05g/cm3and obtain better results than those by using ion-sphere model.Due to the important of free-free absorption in opacity of non-ideal plasma, we study on the free-free absorption coefficients with relation to varied temperature and density of non-ideal argon plasma using average-ion Debye model.Unfortunately the electron are labeled by the principal quantum number n only in SHM model so that it can not obtain the peak corresponds to a 4s-5p transition measured from experiment. In the paper, we improve SHML model (the screened hydrogenic model with 1-splitting). Using the improved SHML model, we calculate the absorption coefficients in bound-bound transitions, and obtain the peak which obtained also in experiment.