Computational design of short pulse laser driven iron opacity experiments

Martin, M. E.; London, R. A.; Goluoglu, S.; Whitley, H. D.

doi:10.1063/1.4976710

Title: Computational design of short pulse laser driven iron opacity experiments

Journal Article · 22 February 2017 · Physics of Plasmas

DOI: https://doi.org/10.1063/1.4976710 · OSTI ID:1345340

Martin, M. E. ^[1]; London, R. A. ^[2]; Goluoglu, S. ^[3]; Whitley, H. D. ^[2]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of Florida, Gainesville, FL (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of Florida, Gainesville, FL (United States)

Here, the resolution of current disagreements between solar parameters calculated from models and observations would benefit from the experimental validation of theoretical opacity models. Iron's complex ionic structure and large contribution to the opacity in the radiative zone of the sun make iron a good candidate for validation. Short pulse lasers can be used to heat buried layer targets to plasma conditions comparable to the radiative zone of the sun, and the frequency dependent opacity can be inferred from the target's measured x-ray emission. Target and laser parameters must be optimized to reach specific plasma conditions and meet x-ray emission requirements. The HYDRA radiation hydrodynamics code is used to investigate the effects of modifying laser irradiance and target dimensions on the plasma conditions, x-ray emission, and inferred opacity of iron and iron-magnesium buried layer targets. It was determined that plasma conditions are dominantly controlled by the laser energy and the tamper thickness. The accuracy of the inferred opacity is sensitive to tamper emission and optical depth effects. Experiments at conditions relevant to the radiative zone of the sun would investigate the validity of opacity theories important to resolving disagreements between solar parameters calculated from models and observations.

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

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1345340

Alternate ID(s):: OSTI ID: 1349350

Report Number(s):: LLNL-JRNL--704606

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Vol. 24; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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