A Quantitative Comparison of Opacities Calculated Using the Distorted-Wave and R-Matrix Methods

F. Delahaye; N. R. Badnell; C. P. Ballance; P. Palmeri; S. Preval; P. Quinet; C. Ramsbottom; R. T. Smyth; M. Turkington; C. J. Zeippen

A Quantitative Comparison of Opacities Calculated Using the Distorted-Wave and R-Matrix Methods

F. Delahaye, N. R. Badnell, C. P. Ballance, P. Palmeri, S. Preval, P. Quinet, C. Ramsbottom, R. T. Smyth, M. Turkington, C. J. Zeippen

School of Mathematics and Physics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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Abstract

The present debate on the reliability of astrophysical opacities has reached a new climax with the recent measurements of Fe opacities on the Z-machine at the Sandia National Laboratory (Bailey et al 2015). To understand the differences between theoretical results, on the one hand, and experiments on the other, as well as the differences among the various theoretical results, detailed comparisons are needed. Many ingredients are involved in the calculation of opacities; deconstructing the whole process and comparing the differences at each step are necessary to quantify their importance and impact on the final results. We present here such a comparison using the two main approaches to calculate the required atomic data, the R-Matrix and distorted-wave methods, as well as sets of configurations and coupling schemes to quantify the effects on the opacities for the Fe XVII and Ni XIV ions.

Original language	English
Title of host publication	Workshop on Astrophysical Opacities: Proceedings
Editors	Claudio Mendoza, Sylvaine Turck-Chieze, James Colgan
Publisher	Astronomical Society of the Pacific
Pages	69-78
Number of pages	10
Volume	515
ISBN (Electronic)	978-1-58381-915-9
ISBN (Print)	978-1-58381-914-2
Publication status	Published - 2018

Publication series

Name	Astronomical Society of the Pacific Conference Series
Volume	515
ISSN (Print)	1050-3390

Bibliographical note

10 pages, 2 figures

Keywords

astro-ph.SR
physics.atom-ph

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A Quantitative Comparison of Opacities Calculated Using the Distorted-Wave and R-Matrix Methods
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Student Theses

R-matrix calculations in support of diagnostics for fusion and astrophysical plasmas

Author: Smyth, R., Jul 2020

Supervisor: Ramsbottom, C. (Supervisor) & Ballance, C. (Supervisor)

Student thesis: Doctoral Thesis › Doctor of Philosophy

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Cite this

Delahaye, F., Badnell, N. R., Ballance, C. P., Palmeri, P., Preval, S., Quinet, P., Ramsbottom, C., Smyth, R. T., Turkington, M., & Zeippen, C. J. (2018). A Quantitative Comparison of Opacities Calculated Using the Distorted-Wave and R-Matrix Methods. In C. Mendoza, S. Turck-Chieze, & J. Colgan (Eds.), Workshop on Astrophysical Opacities: Proceedings (Vol. 515, pp. 69-78). (Astronomical Society of the Pacific Conference Series; Vol. 515). Astronomical Society of the Pacific.

Delahaye, F. ; Badnell, N. R. ; Ballance, C. P. ; Palmeri, P. ; Preval, S. ; Quinet, P. ; Ramsbottom, C. ; Smyth, R. T. ; Turkington, M. ; Zeippen, C. J. / A Quantitative Comparison of Opacities Calculated Using the Distorted-Wave and R-Matrix Methods. Workshop on Astrophysical Opacities: Proceedings. editor / Claudio Mendoza ; Sylvaine Turck-Chieze ; James Colgan. Vol. 515 Astronomical Society of the Pacific, 2018. pp. 69-78 (Astronomical Society of the Pacific Conference Series).

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title = "A Quantitative Comparison of Opacities Calculated Using the Distorted-Wave and R-Matrix Methods",

abstract = "The present debate on the reliability of astrophysical opacities has reached a new climax with the recent measurements of Fe opacities on the Z-machine at the Sandia National Laboratory (Bailey et al 2015). To understand the differences between theoretical results, on the one hand, and experiments on the other, as well as the differences among the various theoretical results, detailed comparisons are needed. Many ingredients are involved in the calculation of opacities; deconstructing the whole process and comparing the differences at each step are necessary to quantify their importance and impact on the final results. We present here such a comparison using the two main approaches to calculate the required atomic data, the R-Matrix and distorted-wave methods, as well as sets of configurations and coupling schemes to quantify the effects on the opacities for the Fe XVII and Ni XIV ions.",

keywords = "astro-ph.SR, physics.atom-ph",

author = "F. Delahaye and Badnell, {N. R.} and Ballance, {C. P.} and P. Palmeri and S. Preval and P. Quinet and C. Ramsbottom and Smyth, {R. T.} and M. Turkington and Zeippen, {C. J.}",

note = "10 pages, 2 figures",

year = "2018",

language = "English",

isbn = "978-1-58381-914-2",

volume = "515",

series = "Astronomical Society of the Pacific Conference Series",

publisher = "Astronomical Society of the Pacific",

pages = "69--78",

editor = "Claudio Mendoza and Sylvaine Turck-Chieze and Colgan, {James }",

booktitle = "Workshop on Astrophysical Opacities: Proceedings",

}

Delahaye, F, Badnell, NR, Ballance, CP, Palmeri, P, Preval, S, Quinet, P, Ramsbottom, C, Smyth, RT, Turkington, M & Zeippen, CJ 2018, A Quantitative Comparison of Opacities Calculated Using the Distorted-Wave and R-Matrix Methods. in C Mendoza, S Turck-Chieze & J Colgan (eds), Workshop on Astrophysical Opacities: Proceedings. vol. 515, Astronomical Society of the Pacific Conference Series, vol. 515, Astronomical Society of the Pacific, pp. 69-78.

A Quantitative Comparison of Opacities Calculated Using the Distorted-Wave and R-Matrix Methods. / Delahaye, F.; Badnell, N. R.; Ballance, C. P.; Palmeri, P.; Preval, S.; Quinet, P.; Ramsbottom, C.; Smyth, R. T.; Turkington, M.; Zeippen, C. J.

Workshop on Astrophysical Opacities: Proceedings. ed. / Claudio Mendoza; Sylvaine Turck-Chieze; James Colgan. Vol. 515 Astronomical Society of the Pacific, 2018. p. 69-78 (Astronomical Society of the Pacific Conference Series; Vol. 515).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - A Quantitative Comparison of Opacities Calculated Using the Distorted-Wave and R-Matrix Methods

AU - Delahaye, F.

AU - Badnell, N. R.

AU - Ballance, C. P.

AU - Palmeri, P.

AU - Preval, S.

AU - Quinet, P.

AU - Ramsbottom, C.

AU - Smyth, R. T.

AU - Turkington, M.

AU - Zeippen, C. J.

N1 - 10 pages, 2 figures

PY - 2018

Y1 - 2018

N2 - The present debate on the reliability of astrophysical opacities has reached a new climax with the recent measurements of Fe opacities on the Z-machine at the Sandia National Laboratory (Bailey et al 2015). To understand the differences between theoretical results, on the one hand, and experiments on the other, as well as the differences among the various theoretical results, detailed comparisons are needed. Many ingredients are involved in the calculation of opacities; deconstructing the whole process and comparing the differences at each step are necessary to quantify their importance and impact on the final results. We present here such a comparison using the two main approaches to calculate the required atomic data, the R-Matrix and distorted-wave methods, as well as sets of configurations and coupling schemes to quantify the effects on the opacities for the Fe XVII and Ni XIV ions.

AB - The present debate on the reliability of astrophysical opacities has reached a new climax with the recent measurements of Fe opacities on the Z-machine at the Sandia National Laboratory (Bailey et al 2015). To understand the differences between theoretical results, on the one hand, and experiments on the other, as well as the differences among the various theoretical results, detailed comparisons are needed. Many ingredients are involved in the calculation of opacities; deconstructing the whole process and comparing the differences at each step are necessary to quantify their importance and impact on the final results. We present here such a comparison using the two main approaches to calculate the required atomic data, the R-Matrix and distorted-wave methods, as well as sets of configurations and coupling schemes to quantify the effects on the opacities for the Fe XVII and Ni XIV ions.

KW - astro-ph.SR

KW - physics.atom-ph

M3 - Conference contribution

SN - 978-1-58381-914-2

VL - 515

T3 - Astronomical Society of the Pacific Conference Series

SP - 69

EP - 78

BT - Workshop on Astrophysical Opacities: Proceedings

A2 - Mendoza, Claudio

A2 - Turck-Chieze, Sylvaine

A2 - Colgan, James

PB - Astronomical Society of the Pacific

ER -

Delahaye F, Badnell NR, Ballance CP, Palmeri P, Preval S, Quinet P et al. A Quantitative Comparison of Opacities Calculated Using the Distorted-Wave and R-Matrix Methods. In Mendoza C, Turck-Chieze S, Colgan J, editors, Workshop on Astrophysical Opacities: Proceedings. Vol. 515. Astronomical Society of the Pacific. 2018. p. 69-78. (Astronomical Society of the Pacific Conference Series).