Speaker
M. A. Gigosos
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P1.2008.pdf
Molecular dynamics simulations of Stark-broadened line shapes of Ar
K-shell ions for plasma diagnostics applications
M. A. Gigosos1 , R. Florido2 , R. C. Mancini3 , J. M. Martín-González2
1 Departamento de Física Teórica, Atómica y Óptica, Univ. de Valladolid, Valladolid, Spain
2 iUNAT - Departamento de Física, Universidad de Las Palmas de Gran Canaria, Spain
3 Department of Physics, University of Nevada, Reno, USA
Analysis of Stark-broadened spectral line profiles is one of the most often used plasma di-
agnostics techniques, especially to determine the electron density in both laboratory and astro-
physical plasmas. The increasing number of applications and the wider availability of spectro-
scopic measurements under extreme conditions have encouraged studies comparing different
computational and analytical methods [1]. In this work we perform numerical simulations to
compute Stark-broadened line shapes of several K-shell X-ray line transitions in highly charged
Ar ions, i.e. Heα, Heβ and Heγ in He-like Ar and Lyα, Lyβ and Lyγ in H-like Ar, which have
been extensively used for spectroscopic diagnosis of implosion cores in indirect- and direct-
drive inertial confinement fusion (ICF) experiments [2]. Two different simulations are done:
a) within the independent particle approximation using a Debye screened field to account for
coupling effects between charges [3] and b) using a molecular dynamics code of interacting
particles [4]. Specifically, an effort has been made to include full Stark-mixing of energy levels
belonging to manifolds with different principal quantum numbers. Comparisons are made with
line shapes calculated in the standard Stark-broadening theory approximation [5, 6]. Observed
differences are discussed. Furthermore, we will assess the impact of employing line profiles
computed with different methods on the diagnosis of core conditions in implosion experiments
performed at OMEGA.
Acknowledgements
This work is supported by Research Grant No. ENE2015-67561-R from Spanish Ministry of
Economy and Competitiveness and EUROfusion Project No. AWP17-ENR-IFE-CEA-02.
References
[1] E. Stambulchik et al., Atoms 2, 378 (2017).
[2] R. C. Mancini et al., High Energy Density Phys. 9, 731 (2013), and references therein.
[3] M. A. Gigosos et al., Astron. Astrophys. 561, A135 (2014), and references therein.
[4] D. González-Herrero, Ph.D. Thesis, Universidad de Valladolid, Spain (2016).
[5] L. A. Woltz and C. F. Hooper, Jr., Phys. Rev. A 38, 4766 (1988).
[6] R. C. Mancini et al., Comput. Phys. Commun. 63, 314 (1991).
