Influence of Microfield Directionality on Line Shapes

Annette Calisti (1) , Alexander Demura (2) , Marco A. Gigosos (3) , Diego Gonzalez-Herrero (3) , Carlos Iglesias (4) , Valery Lisitsa (2) , Evgeny Stambulchik (5)

1 PIIM - Physique des interactions ioniques et moléculaires
2 NRC KI - National Research Center "Kurchatov Institute"
3 Departamento de Optica y Fisica Aplicada
4 LLNL - Lawrence Livermore National Laboratory
5 Plasma Laboratory

In the framework of the Spectral Line Shapes in Plasmas Code Comparison Workshop (SLSP), large discrepancies appeared between the different approaches to account for ion motion effects in spectral line shape calculations. For a better understanding of these effects, in the second edition of the SLSP in August, 2013, two cases were dedicated to the study of the ionic field directionality on line shapes. In this paper, the effects of the direction and magnitude fluctuations are separately analyzed. The effects of two variants of electric field models, (i) a pure rotating field with constant magnitude and (ii) a time-dependent magnitude field in a given direction, together with the effects of the time-dependent ionic field on shapes of the He II Lyman-α and -β lines for different densities and temperatures, are discussed.

Mots clés: spectral line shapes in plasmas; ion dynamics effects; ion microfield fluctuations

Domaines: Physique des plasmas [physics.plasm-ph]

Annette Calisti, Alexander Demura, Marco A. Gigosos, Diego Gonzalez-Herrero, Carlos Iglesias, et al.. Influence of Microfield Directionality on Line Shapes. Atoms, 2014, 2, pp.259-276. ⟨10.3390/atoms2020259⟩. ⟨hal-01010847⟩