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A Comparison of Various NLTE Codes in Computing the Charge-State Populations of an Argon Plasma

Published online by Cambridge University Press:  12 April 2016

Sam R. Stone  and
Jon C. Weisheit
Sam R. Stone
Affiliation:
University of California, Lawrence Livermore National Laboratory Livermore, California 94550
Jon C. Weisheit
Affiliation:
University of California, Lawrence Livermore National Laboratory Livermore, California 94550

Extract

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A comparison among nine computer codes shows surprisingly large differences where it had been believed that the computational physics was well understood. The codes simulate a plasma that is in steady state but not in local thermodynamic equilibrium (NLTE codes). In this study each code treats an “easy” problem, which is an argon plasma, optically thin and with no external photon flux; densities are varied from near-coronal to an intermediate 1021 electrons/cc and above. The temperatures are high enough that most ions have two or fewer bound electrons, which for this plasma means temperatures above about 300 eV.

The present study asks only if the codes compute similar charge-state populations (a surprising “no”), and, if not, why not. It does not claim accuracy for any code either by comparison to experiment or by appeal to a concensus.

Type
Session 4. Theoretical Spectroscopy
Information
International Astronomical Union Colloquium , Volume 86: Eighth International Colloquium on Ultraviolet and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas , 1984 , pp. 108 - 109
Copyright
Copyright © Naval Research Laboratory 1984. Publication courtesy of the Naval Research Laboratory, Washington, DC.