Energy loss of correlated ions in plasmas: Collective and individual contributions

E.M. BRINGA; N.R. ARISTA

PHYSICAL REVIEW E

AMER PHYSICAL SOC

Año: 1996 vol. 54 p. 4101 - 4111

1539-3755

Interference effects in the energy loss of correlated ions in plasmas are studied using classical and quantum models for the dielectric response of the medium. The study covers the ranges of interest for inertial-confinement fusion, Z pinch, and Tokamak plasmas. The relative contributions from collective and individual excitations are evaluated, both for single and correlated ions. We derive analytical approximations for each of these terms. We find that collective excitations give a small contribution to the energy loss of single ions, for a wide range of plasma conditions, but produce the largest contribution to the interference effects for correlated ions. The differences of using classical or quantum cutoff parameters for the stopping and interference terms are analyzed. Numerical calculations of the interference effects for various cases, pertaining to the interaction of ion beams with fusion plasmas, are presented. © 1996 The American Physical Society.