Radiative recombination rate coefficients for highly-charged tungsten ions

Trzhaskovskaya, M. B.; Nikulin, V. K.; Clark, R. E. H.

doi:10.1016/j.adt.2009.08.004

Cited by 17 publications

(17 citation statements)

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“…This will replace the less reliable data used at present, which is mostly based-on average-atom and the Burgess General Formula (for DR), and which gives rise to large uncertainties in the tungsten ionization balance. [27], this work, and the % difference between the two a . The 'Cut' columns correspond to the total RR rate coefficient where we restrict the partial sum up to n = 20 and l = 19 so as to match that of [27].…”

Section: Discussionmentioning

confidence: 99%

“…A non-relativistic dipole top-up was then used to cover the remaining ℓ values which become important at low (non-relativistic) temperatures. In Table III we compare the RR rate coefficients of Trzhaskovskaya et al [27] for 00-like (fully stripped) to ours over log T (K) of 3.0 to 10.0. In this table, we have given our rate coefficients when summed up to n = 999 and ℓ = 150, as well as the rate coefficients when summed up to n = 20 and ℓ = 19.…”

Section: F Rrmentioning

confidence: 99%

“…As mentioned previously, Trzhaskovskaya et al [27][28][29][30] have calculated an extensive set of partial and 'total' (summed to n = 20, ℓ = 19) RR rate coefficients for the whole tungsten isonuclear sequence. Their calculations were fully relativistic, extending to n = 20, ℓ = 19.…”

Section: F Rrmentioning

confidence: 99%

“…The authors state that the majority of their RR rate coefficients were calculated to < 1% numerical accuracy. However, for outer shell RR and high temperatures, their rate coefficients were calculated to < 5% [27]. The authors also present total RR rate coefficients summed up to n = 20 and ℓ = 19.…”

Section: Introductionmentioning

confidence: 99%

“…As such, it is difficult to use such data for collisional-radiative modelling in reliable manner. In contrast, partial RR rate coefficients have been calculated for the entire isonuclear sequence of Tungsten, and the results presented in a series of papers, by Trzhaskovskaya et al [27][28][29][30]. The authors used a Dirac-Fock method with fully relativistic wavefunctions, and included contributions from all significant radiation multipoles.…”

Section: Introductionmentioning

confidence: 99%

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

Preval¹,

Badnell²,

O’Mullane³

2017

J. Phys. B: At. Mol. Opt. Phys.

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Dielectronic recombination (DR) is a key atomic process which affects the spectroscopic diagnostic modelling of tungsten, most of whose ionization stages will be found somewhere in the ITER fusion reactor: in the edge, divertor, or core plasma. Accurate DR data is sparse while complete DR coverage is unsophisticated (e.g. average-atom or Burgess General Formula) as illustrated by the large uncertainties which currently exist in the tungsten ionization balance. To this end, we present a series of partial final-state-resolved and total DR rate coefficients for W 73+ to W 56+ Tungsten ions. This is part of a wider effort within The Tungsten Project to calculate accurate dielectronic recombination rate coefficients for the tungsten isonuclear sequence for use in collisional-radiative modelling of finite-density tokamak plasmas. The recombination rate coefficients have been calculated with autostructure using kappa-averaged relativistic wavefunctions in level resolution (intermediate coupling) and configuration resolution (configuration average). The results are available from OPEN-ADAS according to the adf09 and adf48 standard formats. Comparison with previous calculations of total DR rate coefficients for W 63+ and W 56+ yield agreement to within 20% and 10%, respectively, at peak temperature. It is also seen that the Jüttner correction to the Maxwell distribution has a significant effect on the ionization balance of tungsten at the highest charge states, changing both the peak abundance temperatures and the ionization fractions of several ions. * simon.preval@strath.ac.uk

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Section: Discussionmentioning

confidence: 99%

Section: F Rrmentioning

confidence: 99%

Section: F Rrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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