Skip to Main content Skip to Navigation
Journal articles

A comparison between detailed and configuration-averaged collisional-radiative codes applied to non-local thermal equilibrium plasma

Abstract : A collisional-radiative model describing nonlocal-thermodynamic-equilibrium plasmas is developed. It is based on the HULLAC (Hebrew University Lawrence Livermore Atomic Code) suite for the transitions rates, in the zero-temperature radiation field hypothesis. Two variants of the model are presented: the first one is configuration averaged, while the second one is a detailed level version. Comparisons are made between them in the case of a carbon plasma; they show that the configuration-averaged code gives correct results for an electronic temperature Te=10 eV (or higher) but fails at lower temperatures such as Te=1 eV. The validity of the configuration-averaged approximation is discussed: the intuitive criterion requiring that the average configuration-energy dispersion must be less than the electron thermal energy turns out to be a necessary but far from sufficient condition. Another condition based on the resolution of a modified rate-equation system is proposed. Its efficiency is emphasized in the case of low-temperature plasmas. Finally, it is shown that near-threshold autoionization cascade processes may induce a severe failure of the configuration-average formalism.
Document type :
Journal articles
Complete list of metadatas

Cited literature [25 references]  Display  Hide  Download

https://hal-cea.archives-ouvertes.fr/cea-00179289
Contributor : Michel Poirier <>
Submitted on : Monday, October 15, 2007 - 11:13:46 AM
Last modification on : Wednesday, January 31, 2018 - 12:14:22 PM
Long-term archiving on: : Thursday, September 27, 2012 - 1:05:38 PM

Files

detailed_vs_config-averaged_co...
Files produced by the author(s)

Identifiers

Collections

Citation

Michel Poirier, François de Gaufridy de Dortan. A comparison between detailed and configuration-averaged collisional-radiative codes applied to non-local thermal equilibrium plasma. Journal of Applied Physics, American Institute of Physics, 2007, 101, pp.063308. ⟨10.1063/1.2713085⟩. ⟨cea-00179289⟩

Share

Metrics

Record views

180

Files downloads

531