Sodium tracer measurements of an expanded dense aluminum plasma from e-beam isochoric heating

Ramey, Nicholas Bryan; Coleman, Joshua Eugene; Hakel, Peter; Morris, Heidi E.; Colgan, James Patrick; Barefield, James E.; Fontes, Christopher John; Gilgenbach, Ronald M; McBride, Ryan M

doi:10.1063/5.0040714

Title: Sodium tracer measurements of an expanded dense aluminum plasma from e-beam isochoric heating

Journal Article · Tue Mar 30 00:00:00 EDT 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0040714· OSTI ID:1774468

^[1];

^[2];

^[2]; Gilgenbach, Ronald M ^[3]; McBride, Ryan M ^[3]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Michigan, Ann Arbor, MI (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Michigan, Ann Arbor, MI (United States)

Spatially and temporally resolved visible absorption spectroscopy is performed on sodium D-lines present as surface contaminants on an expanded dense aluminum plasma plume. An 80-ns FWHM, intense, relativistic electron beam deposits 5.4 J into a 100-μm-thick Al foil, which isochorically heats and subsequently hydrodynamically expands the material through the warm dense matter state and into a classical-like plasma state, with a coupling parameter of approximately 0.2 and a degeneracy parameter of approximately 270. The Na contamination, carried along with the expanding plume, shows saturated absorption features in the dense Al continuum for $λ >$ 450 nm. X-ray photoelectron spectroscopy and laser-induced breakdown spectroscopy confirm Na is a surface contaminant with an atomic concentration of $~ 0.1 %$ when interrogating identical foil samples. Additioanlly, a spectroscopic-quality radiation transport model is used to post-process 2D hydrodynamic simulations to interpret the plasma conditions based on the measured Na 3p-3s doublet line profiles. A sodium number density of $3 \times 10^{15}$ cm^-3 best matches the experimental spectra, which originate from a dense surface plasma with $n_{e} = 3.0 \pm 0.8 \times 10^{18}$ cm^-3.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)

Grant/Contract Number:: 89233218CNA000001; DMR-0420785

OSTI ID:: 1774468

Alternate ID(s):: OSTI ID: 1773215

Report Number(s):: LA-UR-20-30285; TRN: US2209227

Journal Information:: Physics of Plasmas, Vol. 28, Issue 3; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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