Electronic Stopping Power of Ions in Cold Targets and Warm Plasmas

Abstract

We report on a new wide range electronic stopping power model that builds on the random phase approximation (RPA) dielectric response formalism of Wang, et al [1] and the local density approximation (LDA) with electronic density distributions calculated in an average atom model using the Flexible Atomic Code (FAC) [2] . The accuracy of this model has been greatly improved by implementing several extensions to RPA theory including a strong collision correction based on the binary collision theory of Zwicknagel for k>kmax [3] , a static local field correction [4] , an electron binding energy correction, and the Barkas effect [5] . The combined corrections bring our RPA-LDA proton stopping power results in cold targets into close agreement with experiments across the periodic table (PSTAR database). We will also show results for the stopping of ions in warm dense plasmas as compared with the published data. We will describe our plans to implement this accurate ion stopping power model into an efficient and robust framework for computing ion energy deposition in HED plasmas spanning a wide range of temperatures and densities and to incorporate them into the HELIOS-CR hydro code (Prism) and Chicago (Voss), as well as an open source standalone code.