INVESTIGATION OF DYNAMICAL PROPERTIES OFDENSE PLASMAS

Abstract

In this paper, we studied the dynamic characteristics of a non-isothermal, dense plasma. On the basis of the effective interaction potential of the particles, a Coulomb logarithm was obtained for a two-temperature, non-isothermal, dense plasma. This potential takes into account quantum-mechanical diffraction effects at short distances and screening effects at large distances in dense plasma. The used model is reliable only at relatively low projectile velocities, the important area around the maximum of the stopping power is adequately described. Therefore, this allowed us to study the dependence of the stopping power on plasma parameters and examine the sen- sitivity of the computed relaxation time and the corresponding equilibrium plasma temperature on the quality of the description of the screening effect in dense plasmas. The computed temperature equilibration in dense plasmas can be very sensitive to the approximation made in the description of the screening effect.According to the obtained results, it follows that the dynamic characteristics of a dense plasma can be adequately expressed in terms of the Coulomb logarithm based on the effective potentials. The energy losses of ions and the relaxation time in plasma are calculated at various temperatures and plasma densities. The results obtained are compared with the theoretical works of other authors and with the results of molecular dynamics simulation and have good agreement.

Keywords:Dense plasma, inertial confinement fusion, Coulomb logarithm, effective potential, stopping power.