Role of Simple Spatial Gradient in Reinforcing the Accuracy of Temperature Determination of HED Plasma via Spectral Line-Area Ratios

We report on the simulation of temperature gradients in tamped NaFMgO target-foil plasma, heated and backlit by z-pinch dynamic hohlraum radiation. Our approach compares the spectroscopic output of a collisional-radiative model (prismspect) with soft X-ray absorption spectra collected on Sandia Nati...

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Bibliographic Details
Published in:Atoms 2023-07, Vol.11 (7), p.104
Main Authors: Riggs, Greg A., Koepke, Mark E., Lane, Ted S., Steinberger, Thomas E., Kozlowski, Pawel M., Golovkin, Igor E.
Format: Article
Language:English
Subjects:
Absorption spectra
diagnostic
Electron energy
Foils
High temperature plasmas
high-energy-density
Investigations
Line spectra
line-area ratio
Plasma
Plasma (Ionized gases)
Properties
Radiation
Ratios
Soft x rays
Spectral sensitivity
Temperature
temperature gradient
X ray absorption
X-rays
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Summary:We report on the simulation of temperature gradients in tamped NaFMgO target-foil plasma, heated and backlit by z-pinch dynamic hohlraum radiation. Our approach compares the spectroscopic output of a collisional-radiative model (prismspect) with soft X-ray absorption spectra collected on Sandia National Laboratories’ (SNL) Z Pulsed Power Facility. The pattern of minimum χ2 is seen to agree with an efficient, three-parameter model. Results show that a negligible gradient in electron temperature Te is consistent with experimental data, justifying the assumptions of previous work. The predicted sensitivity of line spectra to the gradient-aligned profile of Te is documented for each spectral feature, so that the line-area ratio between a pair of spectral features may be assessed as a proxy for the existence and quantification of such gradients.
ISSN:2218-2004
2218-2004
DOI:10.3390/atoms11070104