Testing the reliability of non-LTE spectroscopic models for complex ions

Stephanie Hansen; G. S J Armstrong; S. Bastiani-Ceccotti; C. Bowen; H. K. Chung; J P Colgan; F. de Dortan; C J Fontes; F. Gilleron; J. R. Marquès; R. Piron; O. Peyrusse; M. Poirier; Yu Ralchenko; A. Sasaki; E. Stambulchik; F. Thais

doi:10.1016/j.hedp.2013.05.002

Testing the reliability of non-LTE spectroscopic models for complex ions

Stephanie Hansen^*, G. S J Armstrong, S. Bastiani-Ceccotti, C. Bowen, H. K. Chung, J P Colgan, F. de Dortan, C J Fontes, F. Gilleron, J. R. Marquès, R. Piron, O. Peyrusse, M. Poirier, Yu Ralchenko, A. Sasaki, E. Stambulchik, F. Thais

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

Collisional-radiative atomic models are widely used to help diagnose experimental plasma conditions through fitting and interpreting measured spectra. Here we present the results of a code comparison in which a variety of models determined plasma temperatures and densities by finding the best fit to an experimental L-shell Kr spectrum from a well characterized, but not benchmarked, laser plasma. While variations in diagnostic strategies and qualities of fit were significant, the results generally confirmed the typically quoted uncertainties for such diagnostics of ±20% in electron temperature and factors of about two in density. The comparison also highlighted some model features important for spectroscopic diagnostics: fine structure was required to match line positions and relative intensities within each charge state and for density diagnostics based on emission from metastable states; an extensive configuration set was required to fit the wings of satellite features and to reliably diagnose the temperature through the inferred charge state distribution; and the inclusion of self-consistent opacity effects was an important factor in the quality of the fit.

Original language	English
Pages (from-to)	523-527
Number of pages	5
Journal	High Energy Density Physics
Volume	9
Issue number	3
DOIs	https://doi.org/10.1016/j.hedp.2013.05.002
Publication status	Published - Sep 2013
Externally published	Yes

Keywords

Atomic kinetics
L-shell
Plasma diagnostics
X-ray spectroscopy

ASJC Scopus subject areas

Nuclear and High Energy Physics
Radiation

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10.1016/j.hedp.2013.05.002

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Hansen, S., Armstrong, G. S. J., Bastiani-Ceccotti, S., Bowen, C., Chung, H. K., Colgan, J. P., de Dortan, F., Fontes, C. J., Gilleron, F., Marquès, J. R., Piron, R., Peyrusse, O., Poirier, M., Ralchenko, Y., Sasaki, A., Stambulchik, E., & Thais, F. (2013). Testing the reliability of non-LTE spectroscopic models for complex ions. High Energy Density Physics, 9(3), 523-527. https://doi.org/10.1016/j.hedp.2013.05.002

Hansen, Stephanie ; Armstrong, G. S J ; Bastiani-Ceccotti, S. ; Bowen, C. ; Chung, H. K. ; Colgan, J P ; de Dortan, F. ; Fontes, C J ; Gilleron, F. ; Marquès, J. R. ; Piron, R. ; Peyrusse, O. ; Poirier, M. ; Ralchenko, Yu ; Sasaki, A. ; Stambulchik, E. ; Thais, F. / Testing the reliability of non-LTE spectroscopic models for complex ions. In: High Energy Density Physics. 2013 ; Vol. 9, No. 3. pp. 523-527.

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title = "Testing the reliability of non-LTE spectroscopic models for complex ions",

abstract = "Collisional-radiative atomic models are widely used to help diagnose experimental plasma conditions through fitting and interpreting measured spectra. Here we present the results of a code comparison in which a variety of models determined plasma temperatures and densities by finding the best fit to an experimental L-shell Kr spectrum from a well characterized, but not benchmarked, laser plasma. While variations in diagnostic strategies and qualities of fit were significant, the results generally confirmed the typically quoted uncertainties for such diagnostics of ±20% in electron temperature and factors of about two in density. The comparison also highlighted some model features important for spectroscopic diagnostics: fine structure was required to match line positions and relative intensities within each charge state and for density diagnostics based on emission from metastable states; an extensive configuration set was required to fit the wings of satellite features and to reliably diagnose the temperature through the inferred charge state distribution; and the inclusion of self-consistent opacity effects was an important factor in the quality of the fit.",

keywords = "Atomic kinetics, L-shell, Plasma diagnostics, X-ray spectroscopy",

author = "Stephanie Hansen and Armstrong, {G. S J} and S. Bastiani-Ceccotti and C. Bowen and Chung, {H. K.} and Colgan, {J P} and {de Dortan}, F. and Fontes, {C J} and F. Gilleron and Marqu{\`e}s, {J. R.} and R. Piron and O. Peyrusse and M. Poirier and Yu Ralchenko and A. Sasaki and E. Stambulchik and F. Thais",

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doi = "10.1016/j.hedp.2013.05.002",

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Hansen, S, Armstrong, GSJ, Bastiani-Ceccotti, S, Bowen, C, Chung, HK, Colgan, JP, de Dortan, F, Fontes, CJ, Gilleron, F, Marquès, JR, Piron, R, Peyrusse, O, Poirier, M, Ralchenko, Y, Sasaki, A, Stambulchik, E & Thais, F 2013, 'Testing the reliability of non-LTE spectroscopic models for complex ions', High Energy Density Physics, vol. 9, no. 3, pp. 523-527. https://doi.org/10.1016/j.hedp.2013.05.002

Testing the reliability of non-LTE spectroscopic models for complex ions. / Hansen, Stephanie; Armstrong, G. S J; Bastiani-Ceccotti, S.; Bowen, C.; Chung, H. K.; Colgan, J P; de Dortan, F.; Fontes, C J; Gilleron, F.; Marquès, J. R.; Piron, R.; Peyrusse, O.; Poirier, M.; Ralchenko, Yu; Sasaki, A.; Stambulchik, E.; Thais, F.

In: High Energy Density Physics, Vol. 9, No. 3, 09.2013, p. 523-527.

Research output: Contribution to journal › Article › peer-review

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T1 - Testing the reliability of non-LTE spectroscopic models for complex ions

AU - Hansen, Stephanie

AU - Armstrong, G. S J

AU - Bastiani-Ceccotti, S.

AU - Bowen, C.

AU - Chung, H. K.

AU - Colgan, J P

AU - de Dortan, F.

AU - Fontes, C J

AU - Gilleron, F.

AU - Marquès, J. R.

AU - Piron, R.

AU - Peyrusse, O.

AU - Poirier, M.

AU - Ralchenko, Yu

AU - Sasaki, A.

AU - Stambulchik, E.

AU - Thais, F.

PY - 2013/9

Y1 - 2013/9

N2 - Collisional-radiative atomic models are widely used to help diagnose experimental plasma conditions through fitting and interpreting measured spectra. Here we present the results of a code comparison in which a variety of models determined plasma temperatures and densities by finding the best fit to an experimental L-shell Kr spectrum from a well characterized, but not benchmarked, laser plasma. While variations in diagnostic strategies and qualities of fit were significant, the results generally confirmed the typically quoted uncertainties for such diagnostics of ±20% in electron temperature and factors of about two in density. The comparison also highlighted some model features important for spectroscopic diagnostics: fine structure was required to match line positions and relative intensities within each charge state and for density diagnostics based on emission from metastable states; an extensive configuration set was required to fit the wings of satellite features and to reliably diagnose the temperature through the inferred charge state distribution; and the inclusion of self-consistent opacity effects was an important factor in the quality of the fit.

AB - Collisional-radiative atomic models are widely used to help diagnose experimental plasma conditions through fitting and interpreting measured spectra. Here we present the results of a code comparison in which a variety of models determined plasma temperatures and densities by finding the best fit to an experimental L-shell Kr spectrum from a well characterized, but not benchmarked, laser plasma. While variations in diagnostic strategies and qualities of fit were significant, the results generally confirmed the typically quoted uncertainties for such diagnostics of ±20% in electron temperature and factors of about two in density. The comparison also highlighted some model features important for spectroscopic diagnostics: fine structure was required to match line positions and relative intensities within each charge state and for density diagnostics based on emission from metastable states; an extensive configuration set was required to fit the wings of satellite features and to reliably diagnose the temperature through the inferred charge state distribution; and the inclusion of self-consistent opacity effects was an important factor in the quality of the fit.

KW - Atomic kinetics

KW - L-shell

KW - Plasma diagnostics

KW - X-ray spectroscopy

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DO - 10.1016/j.hedp.2013.05.002

M3 - Article

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JO - High Energy Density Physics

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SN - 1574-1818

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