SIMULATION OF POSITRONIUM PLASMA BY THE MOLECULAR DYNAMICS METHOD

Abstract

In this paper, the relaxation properties of a fully ionized, hot, ideal plasma have
been studied using the molecular dynamics method. As an example, a classical problem of equaliza-
tion of the electron and positron temperatures for various mass ratios is considered, the relaxation
times for temperatures are determined, and the influence of the number of particles and the type of
boundary conditions on the simulation results is studied. The simulation results are compared with
the available theoretical results. In this paper the molecular dynamics method has been used to
study the problem of temperature relaxation in a classical Coulomb system. The dependence of the
properties of such a system on the number of particles has been studied, and the cases of mirror and
periodical boundary conditions have been considered. The analysis of the autocorrelation functions
of the flux of particles of the same sign in the system showed that the correlation decay time in a
system with mirror boundary conditions is reciprocal to the plasma frequency, and in a system with
periodic boundary conditions it has the order of the Langmuir oscillation period. It was also found
that in a system with periodic boundary conditions, the temperature relaxation time is shorter than
in a system with mirror boundary conditions. follows from the analysis of the results, the influence
of the number of particles on the autocorrelation flux functions is insignificant.