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A proposal to measure iron opacity at conditions close to the solar convective zone-radiative zone boundary

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Title: A proposal to measure iron opacity at conditions close to the solar convective zone-radiative zone boundary
Authors: Hoarty, DJ
Morton, J
Jeffery, M
Pattison, LK
Wardlow, A
Mangles, SPD
Rose, SJ
Iglesias, C
Opachich, K
Heeter, RF
Perry, TS
Item Type: Journal Article
Abstract: A major problem in stellar modelling is the discrepancy between solar models and helioseismology data in the position of the convective zone-radiative zone boundary in the sun. This could be explained by a large uncertainty in the calculated opacity data and recent experimental data on iron using the Sandia National Laboratory Z facility have shown large differences, up to a factor of 4, between measurement and prediction at plasma conditions close to the convective zone-radiative zone boundary. This paper describes a proposal for a radiative burn-through experiment to be fielded on NIF to observe if a radiation wave transit through a Fe2O3 sample is consistent with the factor of 2-4 change in the iron opacity seen in the Z experiments. A target design and the diagnostic method are described. A detailed radiation-hydrodynamic model has been used to generate synthetic results and explore the sensitivities and experimental accuracy needed for the proposed measurement.
Issue Date: Jul-2019
Date of Acceptance: 14-May-2019
URI: http://hdl.handle.net/10044/1/70401
DOI: 10.1016/j.hedp.2019.05.003
ISSN: 1574-1818
Publisher: Elsevier
Start Page: 70
End Page: 76
Journal / Book Title: High Energy Density Physics
Volume: 32
Copyright Statement: © 2019 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords: Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Physics
Plasma radiative opacity
Stellar modelling
Radiative transport
ABUNDANCE
PLASMAS
02 Physical Sciences
Fluids & Plasmas
Publication Status: Published
Online Publication Date: 2019-05-14
Appears in Collections:Physics
Plasma Physics
Faculty of Natural Sciences