Development and Application of Krypton Spectroscopy for Spatially Resolved Analysis of Hot Implosion Cores
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Authors
Gallardo Diaz, Enac
Issue Date
2024
Type
Dissertation
Language
en_US
Keywords
Diagnostic , Imager , Implosion Cores , Krypton , Plasma , Spectroscopy
Alternative Title
Abstract
A novel diagnostic technique utilizing krypton spectroscopy has been developed to obtain spatially resolved plasma conditions in hot implosion cores. Traditional diagnostic methods based on argon K-shell emission (3-5 keV) are limited to relatively low electron temperatures, below 2000 eV; however, this new technique enables the analysis of plasmas at significantly higher temperatures. To extract plasma conditions in these hot implosion cores, the atomic kinetics, Stark broadening and radiation transport effects were modeled for the Kr L-shell (2-4 keV) [1] and K-shell (12-16 keV) [2] spectral regions. As a result, spectral databases for these regions were developed, which showed sensitivity to electron temperature (Te) and density (ne). New Kr Multi-Monochromatic X-ray Imagers (MMI) were developed for both L-shell and K-shell regions to record the spatially resolved spectra needed to extract Te and ne distributions. The L-shell design involved a minor modification of the previous Ar MMI design, while the Kr K-shell required a major redesign of the instrument. For the Kr L-shell case, it was observed that the experimental setup using glass shell capsules did not allow for the detection of useful data. However, the Kr K-shell MMI achieved unprecedented 2D spatially resolved and time-gated Kr spectral measurements [4]. Analysis of these spectra, informed by the modeled Kr database, has produced the first 2D spatial distributions of core Te and ne at Te > 2000 eV. These measurements enable the calculation of spatial distributions of various plasma parameters, including pressure, radiation losses, and electron thermal transport. Furthermore, the results will be used to benchmark ion stopping power models in hot plasmas and to investigate differences between hydrodynamic and kinetic implosion regimes. This advancement provides a new approach to the study of High Energy Density plasmas.
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Citation
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License
CC BY