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

• Published in: Atoms Vol. 11; no. 7; p. 104
• Main Authors: Riggs, Greg A., Koepke, Mark E., Lane, Ted S., Steinberger, Thomas E., Kozlowski, Pawel M., Golovkin, Igor E.
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.07.2023
• 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; United States
• ISSN: 2218-2004; 2218-2004
• DOI: 10.3390/atoms11070104

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.