SWIFT ION ENERGY LOSSES IN DENSE PLASMAS

Abstract

Swift ion energy losses are calculated for nonideal classical and degenerate quantum plasmas on the basis of local field theories. It is shown that correlational effects leading to a difference between average fields and local fields may influence essentially energy losses in such plasmas. In particular, for ions whose velocity v is much smaller than the plasma electron thermal velocity the stopping power increases (for classical plasmas) by a factor 1+(2g/9), g is the classical plasma parameter, as compared with Vlasov approximation. For degenerate quantum plasmas the stopping power increases (under a similar assumption v ≪ vF, vF is the Fermi velocity) in result of the local field effects by a factor which can reach a few tens of percent (as compared with Lindhard stopping power) for some compressed ICF plasmas. Corresponding factors for nonideal degenerate plasmas in some simple metals are as much as 2-3 and are in agreement with experiment.