Numerical investigations of potential systematic uncertainties in iron opacity measurements at solar interior temperatures

Nagayama, T.; Bailey, J. E.; Loisel, G. P.; Rochau, G. A.; MacFarlane, J. J.; Golovkin, I. E.

doi:10.1103/PhysRevE.95.063206

Title: Numerical investigations of potential systematic uncertainties in iron opacity measurements at solar interior temperatures

Journal Article · Mon Jun 26 00:00:00 EDT 2017 · Physical Review E

DOI:https://doi.org/10.1103/PhysRevE.95.063206· OSTI ID:1372356

Nagayama, T. ^[1]; Bailey, J. E. ^[1]; Loisel, G. P. ^[1]; Rochau, G. A. ^[1]; MacFarlane, J. J. ^[2]; Golovkin, I. E. ^[2]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Prism Computational Sciences, Madison, WI (United States)

Iron opacity calculations presently disagree with measurements at an electron temperature of ~180–195 eV and an electron density of (2–4)×10²²cm^–3, conditions similar to those at the base of the solar convection zone. The measurements use x rays to volumetrically heat a thin iron sample that is tamped with low-Z materials. The opacity is inferred from spectrally resolved x-ray transmission measurements. Plasma self-emission, tamper attenuation, and temporal and spatial gradients can all potentially cause systematic errors in the measured opacity spectra. In this article we quantitatively evaluate these potential errors with numerical investigations. The analysis exploits computer simulations that were previously found to reproduce the experimentally measured plasma conditions. The simulations, combined with a spectral synthesis model, enable evaluations of individual and combined potential errors in order to estimate their potential effects on the opacity measurement. Lastly, the results show that the errors considered here do not account for the previously observed model-data discrepancies.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1372356

Alternate ID(s):: OSTI ID: 1366583

Report Number(s):: SAND-2017-3121J; PLEEE8; 651987

Journal Information:: Physical Review E, Vol. 95, Issue 6; ISSN 2470-0045

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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References (18)

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