Assessing the existence of non-LTE behavior in aluminum K-shell diagnostic lines from dynamic hohlraum driven experiments

We describe in this work a study designed to obtain insight into the sensitivity of foil targets driven out of local thermodynamic equilibrium (LTE) by an idealized dynamic hohlraum during its brightest phase. This work is motivated by a perceived over-prediction of the plasma temperature by current...

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Published inJournal of physics. B, Atomic, molecular, and optical physics Vol. 48; no. 22; pp. 224007 - 224011
Main Author Sherrill, M E
Format Journal Article
LanguageEnglish
Published United States IOP Publishing 28.11.2015
Subjects
Aluminum
complete linearization method
Dynamic tests
Dynamics
Hohlraums
Mathematical models
Modelling
non-LTE
Opacity
radiative transfer
Spectra
x-ray spectroscopy
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Summary:We describe in this work a study designed to obtain insight into the sensitivity of foil targets driven out of local thermodynamic equilibrium (LTE) by an idealized dynamic hohlraum during its brightest phase. This work is motivated by a perceived over-prediction of the plasma temperature by current LTE spectral modeling of opacity experiments performed by Bailey et al at the Sandia Z facility. Although several aspects of this modeling study parallel the SNL/LANL opacity experiments, this work is primarily intended to gain insight into radiatively over-driven systems. The results from this idealized study suggest that a non-LTE population distribution with qualities similar to an LTE distribution at higher material temperatures are possible, and therefore support a further theoretical investigation with experimental parameters.
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USDOE
LA-UR-15-22104
89233218CNA000001
ISSN:0953-4075
1361-6455
DOI:10.1088/0953-4075/48/22/224007