Optimisation and assessment of theoretical impurity line power coefficients relevant to ITER and DEMO

S S Henderson, M Bluteau, A Foster, A Giunta, M G O'Mullane, T Pütterich, H P Summers

Research output: Contribution to journalArticle

5 Citations (Scopus)
11 Downloads (Pure)

Abstract

Total radiated line power coefficients for ions of medium to heavy weight elements, called PLT coefficients in the Atomic Data and analysis Structure (ADAS), have been improved by algorithmically optimising the selection of configuration sets that underpin the calculation to include the most important radiating transitions driven by both the ground and metastable configurations and to establish and limit the error of truncation. The optimised calculations typically differ from Pütterich by 20 − 30% with truncation error ≲5%. Further appraisal of error due to atomic level bundling, atomic structure and collision strength calculation methods has been carried out. It is shown that bundling to configurations is accurate to ≲10% for all ions except those with closed-shell ground configurations which give errors up to a factor 2−3. For near neutral, closed-shell ions, plane-wave Born collision strength calculations, which omit spin-change, give substantial error in comparison with distorted-wave calculations of PLT. For highly charged ions, spin-system breakdown reduces the error in the PLT markedly, typically ≲10%. The error introduced by the atomic structure codes used here, autostructure and the cowan code, is probably limited to ≲30%.
Original languageEnglish
Article number055010
Pages (from-to)1-8
Number of pages8
JournalPlasma Physics and Controlled Fusion
Volume59
Issue number5
Early online date23 Feb 2017
DOIs
Publication statusPublished - 21 Mar 2017

Fingerprint

power lines
Impurities
impurities
optimization
coefficients
configurations
atomic structure
Ions
ions
truncation errors
atomic collisions
data structures
plane waves
breakdown
collisions
approximation

Keywords

  • total radiated line power coefficients
  • error
  • atomic level bundling
  • atomic structure
  • collision strength
  • electron configuration sets
  • cooling factor

Cite this

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title = "Optimisation and assessment of theoretical impurity line power coefficients relevant to ITER and DEMO",
abstract = "Total radiated line power coefficients for ions of medium to heavy weight elements, called PLT coefficients in the Atomic Data and analysis Structure (ADAS), have been improved by algorithmically optimising the selection of configuration sets that underpin the calculation to include the most important radiating transitions driven by both the ground and metastable configurations and to establish and limit the error of truncation. The optimised calculations typically differ from P{\"u}tterich by 20 − 30{\%} with truncation error ≲5{\%}. Further appraisal of error due to atomic level bundling, atomic structure and collision strength calculation methods has been carried out. It is shown that bundling to configurations is accurate to ≲10{\%} for all ions except those with closed-shell ground configurations which give errors up to a factor 2−3. For near neutral, closed-shell ions, plane-wave Born collision strength calculations, which omit spin-change, give substantial error in comparison with distorted-wave calculations of PLT. For highly charged ions, spin-system breakdown reduces the error in the PLT markedly, typically ≲10{\%}. The error introduced by the atomic structure codes used here, autostructure and the cowan code, is probably limited to ≲30{\%}.",
keywords = "total radiated line power coefficients, error, atomic level bundling, atomic structure, collision strength, electron configuration sets, cooling factor",
author = "Henderson, {S S} and M Bluteau and A Foster and A Giunta and O'Mullane, {M G} and T P{\"u}tterich and Summers, {H P}",
note = "This is an author-created, un-copyedited version of an article published in Plasma Physics and Controlled Fusion. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-6587/aa6273.",
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Optimisation and assessment of theoretical impurity line power coefficients relevant to ITER and DEMO. / Henderson, S S; Bluteau, M; Foster, A; Giunta, A; O'Mullane, M G; Pütterich, T; Summers, H P.

In: Plasma Physics and Controlled Fusion, Vol. 59, No. 5, 055010, 21.03.2017, p. 1-8.

Research output: Contribution to journalArticle

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AU - Bluteau, M

AU - Foster, A

AU - Giunta, A

AU - O'Mullane, M G

AU - Pütterich, T

AU - Summers, H P

N1 - This is an author-created, un-copyedited version of an article published in Plasma Physics and Controlled Fusion. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-6587/aa6273.

PY - 2017/3/21

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N2 - Total radiated line power coefficients for ions of medium to heavy weight elements, called PLT coefficients in the Atomic Data and analysis Structure (ADAS), have been improved by algorithmically optimising the selection of configuration sets that underpin the calculation to include the most important radiating transitions driven by both the ground and metastable configurations and to establish and limit the error of truncation. The optimised calculations typically differ from Pütterich by 20 − 30% with truncation error ≲5%. Further appraisal of error due to atomic level bundling, atomic structure and collision strength calculation methods has been carried out. It is shown that bundling to configurations is accurate to ≲10% for all ions except those with closed-shell ground configurations which give errors up to a factor 2−3. For near neutral, closed-shell ions, plane-wave Born collision strength calculations, which omit spin-change, give substantial error in comparison with distorted-wave calculations of PLT. For highly charged ions, spin-system breakdown reduces the error in the PLT markedly, typically ≲10%. The error introduced by the atomic structure codes used here, autostructure and the cowan code, is probably limited to ≲30%.

AB - Total radiated line power coefficients for ions of medium to heavy weight elements, called PLT coefficients in the Atomic Data and analysis Structure (ADAS), have been improved by algorithmically optimising the selection of configuration sets that underpin the calculation to include the most important radiating transitions driven by both the ground and metastable configurations and to establish and limit the error of truncation. The optimised calculations typically differ from Pütterich by 20 − 30% with truncation error ≲5%. Further appraisal of error due to atomic level bundling, atomic structure and collision strength calculation methods has been carried out. It is shown that bundling to configurations is accurate to ≲10% for all ions except those with closed-shell ground configurations which give errors up to a factor 2−3. For near neutral, closed-shell ions, plane-wave Born collision strength calculations, which omit spin-change, give substantial error in comparison with distorted-wave calculations of PLT. For highly charged ions, spin-system breakdown reduces the error in the PLT markedly, typically ≲10%. The error introduced by the atomic structure codes used here, autostructure and the cowan code, is probably limited to ≲30%.

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KW - collision strength

KW - electron configuration sets

KW - cooling factor

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