Computational design of short pulse laser driven iron opacity experiments
Abstract
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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1345340
- Alternate Identifier(s):
- OSTI ID: 1349350
- Report Number(s):
- LLNL-JRNL-704606
Journal ID: ISSN 1070-664X; TRN: US1700690
- Grant/Contract Number:
- AC52-07NA27344
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 24; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION; opacity; emission; design; sun; modeling; short pulse lasers
Citation Formats
Martin, M. E., London, R. A., Goluoglu, S., and Whitley, H. D. Computational design of short pulse laser driven iron opacity experiments. United States: N. p., 2017.
Web. doi:10.1063/1.4976710.
Martin, M. E., London, R. A., Goluoglu, S., & Whitley, H. D. Computational design of short pulse laser driven iron opacity experiments. United States. doi:https://doi.org/10.1063/1.4976710
Martin, M. E., London, R. A., Goluoglu, S., and Whitley, H. D. Thu .
"Computational design of short pulse laser driven iron opacity experiments". United States. doi:https://doi.org/10.1063/1.4976710. https://www.osti.gov/servlets/purl/1345340.
@article{osti_1345340,
title = {Computational design of short pulse laser driven iron opacity experiments},
author = {Martin, M. E. and London, R. A. and Goluoglu, S. and Whitley, H. D.},
abstractNote = {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.},
doi = {10.1063/1.4976710},
journal = {Physics of Plasmas},
number = ,
volume = 24,
place = {United States},
year = {2017},
month = {2}
}
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