Approximate methods of taking into account nonequilibrium radiation field in plasmas

In certain plasma physics problems it is very important to take into account nonequilibrium of the radiation field. Primarily it concerns laser and pinch plasmas characterized by stiff density and temperature gradients. In this paper, a method is presented for approximate accounting for the nonequilibrium of the radiation field in plasmas, which is based on the approximation of the real radiation field by a parameterized Planckian function with subsequent interpolation of plasma properties on a certain tabulated basis. A comparison with several other approximate methods for taking into account the plasma nonequilibrium showed that the proposed method has promising potential.