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

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Henderson, S S and Bluteau, M and Foster, A and Giunta, A and O'Mullane, M G and Pütterich, T and Summers, H P (2017) Optimisation and assessment of theoretical impurity line power coefficients relevant to ITER and DEMO. Plasma Physics and Controlled Fusion, 59 (5). pp. 1-8. 055010. ISSN 0741-3335 (https://doi.org/10.1088/1361-6587/aa6273)

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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%.

ORCID iDs

Henderson, S S ORCID logoORCID: https://orcid.org/0000-0002-8205-4437, Bluteau, M ORCID logoORCID: https://orcid.org/0000-0001-9498-8475, Foster, A, Giunta, A, O'Mullane, M G ORCID logoORCID: https://orcid.org/0000-0002-2160-4546, Pütterich, T and Summers, H P;
  • Item type:Article
    ID code:60266
    Dates:
    Date
    Event
    21 March 2017
    Published
    23 February 2017
    Published Online
    23 February 2017
    Accepted
    Notes: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.
    Subjects:Science > Physics > Plasma physics. Ionized gases
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:23 Mar 2017 12:29
    Last modified:23 Nov 2024 01:09
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/60266
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