MEDIUM ION MODEL FOR COMPUTATION OF MULTI-CHARGE, MULTI-COMPONENT TIME-DEPENDENT AND NONEQUILIBRIUM PLASMA STATE

S.A. Bel´kov, P.D. Gasparyan, Yu.K. Kochubey, E.I. Mitrofanov
VANT. Ser.: Mat. Mod. Fiz. Proc 1997. Вып.1. С. 45.

      Ionization kinetics of multi-charge, time-dependent, nonequilibrium plasma in the medium ion approximation is studied. Approximations hydrogen-like ion whose energy levels depend-both only on the principal quantum – number and on the principal and orbital quantum numbers are considered as the atom models. Computed results were presented for various plasrna characteristics found within this model, comparison with earlier published data, as well, as with computations in the chemical bond approximation was made. The medium ion model was shown to describe spectral characteristics of nonideal plasma satisfactorily.

      In target laser irradiation experiments of great interest is the process of collision „of plasma counter-flows. In the region of flow interaction mean ion ranges are known to be comparable with or higher than characteristics flow sizes. Therefore, to study this phenomenon, numerical techniques based on kinetic plasma models are needed. At the same time in unperturbed flow regions ion ranges are considerably less than the characteristic sizes and consideration of these regions at the kinetic level involves unacceptable computer costs. This, work proposes a technique for numerical computations of planar plasma flows where ion processes are considered at the kinetic level. It is based on the Monte Carlo method and involves about the same computer costs in the regions of low and high ion ranges.