Iron X-ray Transmission at Temperature Near 150 eV Using the National Ignition Facility: First Measurements and Paths to Uncertainty Reduction

Heeter, Robert; Perry, Ted; Johns, Heather; Opachich, Kathy; Ahmed, Maryum; Emig, Jim; Holder, Joe; Iglesias, Carlos; Liedahl, Duane; London, Richard; Martin, Madison; Thompson, Nathaniel; Wilson, Brian; Archuleta, Tom; Cardenas, Tana; Dodd, Evan; Douglas, Melissa; Flippo, Kirk; Fontes, Christopher; Kline, John; Kot, Lynn; Krasheninnikova, Natalia; Sherrill, Manolo; Urbatsch, Todd; Huffman, Eric; King, James; Knight, Russell; Bailey, James; Rochau, Gregory

doi:10.3390/atoms6040057

Title: Iron X-ray Transmission at Temperature Near 150 eV Using the National Ignition Facility: First Measurements and Paths to Uncertainty Reduction

Journal Article · Fri Oct 26 00:00:00 EDT 2018 · Atoms

DOI:https://doi.org/10.3390/atoms6040057· OSTI ID:1502020

^[1]; Perry, Ted ^[2]; Johns, Heather ^[2]; Opachich, Kathy ^[3]; Ahmed, Maryum ^[1]; Emig, Jim ^[1]; Holder, Joe ^[1]; Iglesias, Carlos ^[1]; Liedahl, Duane ^[1]; London, Richard ^[1]; Martin, Madison ^[1]; Thompson, Nathaniel ^[1]; Wilson, Brian ^[1]; Archuleta, Tom ^[2]; Cardenas, Tana ^[2]; Dodd, Evan ^[2]; Douglas, Melissa ^[2]; Flippo, Kirk ^[2]; Fontes, Christopher ^[2]; Kline, John ^[2] more »

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Nevada National Security Site (NNSS), Livermore, CA (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Discrepancies exist between theoretical and experimental opacity data for iron, at temperatures 180–195 eV and electron densities near 3 × 10²²/cm³, relevant to the solar radiative-convective boundary. Another discrepancy, between theory and helioseismic measurements of the boundary’s location, would be ameliorated if the experimental opacity is correct. To address these issues, this paper details the first results from new experiments under development at the National Ignition Facility (NIF), using a different method to replicate the prior experimental conditions. In the NIF experiments, 64 laser beams indirectly heat a plastic-tamped rectangular iron-magnesium sample inside a gold cavity. Another 64 beams implode a spherical plastic shell to produce a continuum X-ray flash which backlights the hot sample. An X-ray spectrometer records the transmitted X-rays, the unattenuated X-rays passing around the sample, and the sample’s self-emission. From these data, X-ray transmission spectra are inferred, showing Mg K-shell and Fe L-shell X-ray transitions from plasma at a temperature of ~150 eV and electron density of ~8 × 10²¹/cm³. These conditions are similar to prior Z measurements which agree better with theory. The NIF transmission data show statistical uncertainties of 2–10%, but various systematic uncertainties must be addressed before pursuing quantitative comparisons. The paths to reduction of the largest uncertainties are discussed. Once the uncertainty is reduced, future NIF experiments will probe higher temperatures (170–200 eV) to address the ongoing disagreement between theory and Z data.=

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1502020

Report Number(s):: LLNL-JRNL-757217; ATOMC5; 939528

Journal Information:: Atoms, Vol. 6, Issue 4; ISSN 2218-2004

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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Title: Iron X-ray Transmission at Temperature Near 150 eV Using the National Ignition Facility: First Measurements and Paths to Uncertainty Reduction

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