Opacity calculation for target physics using the ABAKO/RAPCAL code

Abstract

Radiative properties of hot dense plasmas remain a subject of current interest since they play an important role in inertial confinement fusión (ICF) research, as well as in studies on stellar physics. In particular, the understanding of ICF plasmas requires emissivities and opacities for both hydro-simulations and diagnostics. Nevertheless, the accurate calculation of these properties is still an open question and continuous efforts are being made to develop new models and numerical codes that can facilítate the PACS' evaluation of such properties. In this work the set of atomic models ABAKO/RAPCAL is presented, as well as a series of results for carbón and aluminum to show its capability for modeling the population kinetics Keywords:of plasmas in both LTE and NLTE regimes. AIso, the spectroscopic diagnostics of a laser-produced Opacities aluminum plasma using ABAKO/RAPCAL is discussed. Additionally, as an interesting application of these Emissivities codes, fitting analytical formulas for Rosseland and Planck mean opacities for carbón plasmas are Population kinetics reported. These formulas are useful as input data in hydrodynamic simulation of targets where the computation task is so hard that in line computation with sophisticated opacity codes is prohibitive.

Determination and Analysis of the Thermodynamic Regimes of Xenon Plasmas

“…The total radiative power loss is then obtained as the sum of the three contributions. ABAKO and RAPCAL codes have been successfully tested with experimental results and numerical simulations for plasmas of both low and high Z-elements (for example: carbon, aluminium, argon, krypton, xenon or gold), either under LTE or NLTE conditions, in optically thin and thick (homogeneous and non-homogeneous) situations [22,23,25,45] and, recently, it has been proved their utility in K-shell spectroscopic diagnostics of aluminium [46] and argon [47,48] plasmas obtained in experiments carried out at LULI and OMEGA facilities, respectively. With respect to the simulations of xenon plasmas, in a previous work [23] was performed a numerical simulation of an experiment carried out at LULI [49] where an optically thick stationary xenon plasma was obtained.…”

<title>Calculation of the radiative opacity for some low Z plasmas produced by high power pulsed lasers</title>

“…In order to find this maximum, the plasma temperature was changed and the opacities were calculated for a fixed plasma density of 1000 g.cm −3 and for 1 keV photons. The results are presented in figure (5). The behavior of the opacity with respect to temperature is mainly related to ionization degree of the plasma and recombination.…”

“…Due to the wide practical applications of radiative opacity, it has remained a subject of current studies until now. 5,6 In plasmas, some properties such as temperature, density and different ionization stage distribution can be determined by diagnosis of plasma radiation. However, the plasma radiation is influenced by opacity that leads to non realistic characterization.…”

Opacity of germanium and silicon in ICF plasmas

“…Analytical expressions for mean opacities would be useful. In a recent work on the opacity of carbon 17 analytical expressions that fit fairly well the calculated opacities are proposed. …”