Partial and total dielectronic recombination rate coefficients for W55+ to W38+

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Preval, S P and Badnell, N R and O'Mullane, M G (2017) Partial and total dielectronic recombination rate coefficients for W55+ to W38+. Journal of Physics B: Atomic, Molecular and Optical Physics, 50 (10). 105201. ISSN 0953-4075 (https://doi.org/10.1088/1361-6455/aa6a3c)

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Abstract

Dielectronic recombination (DR) is the dominant mode of recombination in magnetically confined fusion plasmas for intermediate to low-charged ions of W. Complete, final-state resolved partial isonuclear W DR rate coefficient data is required for detailed collisional-radiative modelling for such plasmas in preparation for the upcoming fusion experiment ITER. To realize this requirement, we continueThe Tungsten Project by presenting our calculations for tungsten ions W55+ to W38+. As per our prior calculations for W73+ to W56+, we use the collision package AUTOSTRUCTURE to calculate partial and total DR rate coefficients for all relevant core-excitations in intermediate coupling (IC) and configuration average (CA) using κ-averaged relativistic wavefunctions. Radiative recombination (RR) rate coefficients are also calculated for the purpose of evaluating ionization fractions. Comparison of our DR rate coefficients for W46+ with other authors yields agreement to within 7-19% at peak abundance verifying the reliability of our method. Comparison of partial DR rate coefficients calculated in IC and CA yield differences of a factor ∼ 2 at peak abundance temperature, highlighting the importance of relativistic configuration mixing. Large differences are observed between ionization fractions calculated using our recombination rate coefficient data and that of Pütterich et al [Plasma Phys. and Control. Fusion 50 085016, (2008)]. These differences are attributed to deficiencies in the average-atom method used by the former to calculate their data.

ORCID iDs

Preval, S P ORCID logoORCID: https://orcid.org/0000-0001-8552-0766, Badnell, N R ORCID logoORCID: https://orcid.org/0000-0001-7418-7996 and O'Mullane, M G ORCID logoORCID: https://orcid.org/0000-0002-2160-4546;
  • Item type:Article
    ID code:60370
    Dates:
    Date
    Event
    27 April 2017
    Published
    30 March 2017
    Accepted
    Notes:This is an author-created, un-copyedited version of an article accepted for publication in Journal of Physics B: Atomic, Molecular and Optical Physics. 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/10.1088/1361-6455/aa6a3c.
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:30 Mar 2017 15:50
    Last modified:11 Nov 2024 11:40
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/60370
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