Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

H-β Line in a Corona Helium Plasma: A Multi-Code Line Shape Comparison

Roshin Raj Sheeba
* ,
Mohammed Koubiti
ORCID logo ,
Nelly Bonifaci
,
Franck Gilleron
,
Caroline Mossé
,
Jean-Christophe Pain
ORCID logo ,
Joël Rosato
,
Evgeny Stambulchik
Version 1 : Received: 5 March 2018 / Approved: 6 March 2018 / Online: 6 March 2018 (03:51:17 CET)

A peer-reviewed article of this Preprint also exists.

Sheeba, R.R.; Koubiti, M.; Bonifaci, N.; Gilleron, F.; Mossé, C.; Pain, J.-C.; Rosato, J.; Stambulchik, E. H-β Line in a Corona Helium Plasma: A Multi-Code Line Shape Comparison. Atoms 2018, 6, 29. Sheeba, R.R.; Koubiti, M.; Bonifaci, N.; Gilleron, F.; Mossé, C.; Pain, J.-C.; Rosato, J.; Stambulchik, E. H-β Line in a Corona Helium Plasma: A Multi-Code Line Shape Comparison. Atoms 2018, 6, 29.

Abstract

Many spectroscopic diagnostics are routinely used as a technique to infer the plasma parameters from line emission spectra but their accuracy depends on the numerical model or code used for the fitting process. However, the validation of a line shape code requires some steps : comparison of the line shape code with other similar codes for some academic (simple) cases and then more complex ones, comparison of the fitting parameters obtained from the best fit of the experimental spectra with those obtained with other diagnostic techniques and/or comparison of the fitting parameters obtained by different codes to fit the same experimental data. Here we compare the profiles of the hydrogen Balmer β line in a helium plasma computed by six codes for a selected set of plasma parameters and we report on the plasma parameters inferred by each of them from the fitting to a number of experimental spectra measured in a helium corona discharge where the pressure was in the range 1- 5 bar.

Keywords

stark broadening; van der waals broadening; line shapes; helium plasma; corona discharge; plasma diagnostics; code comparison; neutral broadening; pressure broadening

Subject

Physical Sciences, Atomic and Molecular Physics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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