Total dielectronic recombination rate coefficient for Ar-like tungsten

Peleg, Avner; Behar, E.; Mandelbaum, P.; Schwob, J. L.

doi:10.1103/physreva.57.3493

Cited by 33 publications

(30 citation statements)

References 16 publications

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“…Good agreement is found between our rate coefficients and those of [21] and [22] for 10-like and 18-like, differing by ∼ 10% at the peak abundance temperature. Poor agreement was found when comparing with the 10-like results of [20], with differences of ∼50%.…”

Section: Discussionsupporting

confidence: 63%

“…In Table VI we compare our 18-like total DR rate coefficients with the hullac ones of Peleg et al [22]. Agreement is better in this case over a wider range of temperatures, being < ∼ 10% at peak abundance.…”

Section: E Comparison With Other Dr Workmentioning

confidence: 77%

“…We have compared our total DR rate coefficients to the results of calculations provided by Behar et al [21] and Safronova et al [20] for 10-like, and Peleg et al [22] for 18-like tungsten.…”

Section: Discussionmentioning

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: Discussionsupporting

confidence: 63%

Section: E Comparison With Other Dr Workmentioning

confidence: 77%

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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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“…An open d-shell (with more than two electrons and less than two free holes) offers a considerably larger number of levels such that for the LR calculations only a limited number of configurations have been included. In fact, enough configurations have been included to predict important spectral features as observed in experiment [13], but for predicting the total radiated power 30(1.4) 40(2.7) 50(7.0) 60 (16) 70 (50) additional emissions that are not so obvious in the spectra become important. The fact that the CA-LR calculation agrees with the LR calculation supports the finding that the CA-LR calculation is consistent and numerically stable.…”

Section: Line Radiationmentioning

confidence: 99%

“…Concerning the recombination rates, it should be noted that there are rates of higher quality for a few ionization stages (e.g. DR rates of Ni-like W [15], Ar-like W [16] and Ne-like W [17]) available. However, for a compilation of the cooling factor, rates for all ions are needed.…”

Section: Ionization Equilibriummentioning

confidence: 99%

Calculation and experimental test of the cooling factor of tungsten

Pütterich¹,

Neu²,

Dux³

et al. 2010

Nucl. Fusion

217

196

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Abstract. The cooling factor of W is evaluated using state of the art data for line radiation and an ionization balance which has been benchmarked with experiment. For the calculation of line radiation, level-resolved calculations were performed with the Cowan code to obtain the electronic structure and excitation cross sections (plane-wave Born approximation). The data were processed by a collisional radiative model to obtain electron density dependent emissions. These data were then combined with the radiative power derived from recombination rates and Bremsstrahlung to obtain the total cooling factor. The effect of uncertainties in the recombination rates on the cooling factor were studied and were identified to be of secondary importance. The new cooling factor is benchmarked, by comparisons of the line radiation to spectral measurements as well as to a direct measurement of the cooling factor. Additionally, a less detailed calculation using a configuration averaged model was performed. It was used to benchmark the level-resolved calculations and to improve the prediction on radiation power from line radiation for ionization stages which are computationally challenging. The obtained values for the cooling factor validate older predictions from literature. Its ingredients and the absolute value are consistent with the existing experimental results regarding the value itself, the spectral distibution of emissions and the ionization equilibrium. A table of the cooling factor versus electron temperature is provided. Finally, the cooling factor is used to investigate the operational window of a fusion reactor with W as intrinsic impurity. The minimum value of ¤ ¦ ¥ § © , for which a thermonuclear burn is possible, is increased by 20% for a W concentration of " !

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Iso-nuclear tungsten dielectronic recombination rates for use in magnetically-confined fusion plasmas

Kwon

Lee

Preval

et al. 2018

Atomic Data and Nuclear Data Tables

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Under the auspices of the IAEA Atomic and Molecular Data Center and the Korean Atomic Energy Research Institute, our assembled group of authors has reviewed the current state of dielectronic recombination (DR) rate coefficients for various ion stages of tungsten (W). Subsequent recommendations were based upon available experimental data, first-principle calculations carried out in support of this paper and from available recombination data within existing atomic databases. If a recommendation was possible, data were compiled, evaluated and fitted to a functional form with associated uncertainty information retained, where available. This paper also considers the variation of the W fractional abundance due to the underlying atomic data when employing different data sets

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Total dielectronic recombination rate coefficient for Ar-like tungsten

Cited by 33 publications

References 16 publications

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

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

Calculation and experimental test of the cooling factor of tungsten

Iso-nuclear tungsten dielectronic recombination rates for use in magnetically-confined fusion plasmas

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Total dielectronic recombination rate coefficient for Ar-like tungsten

Cited by 33 publications

References 16 publications

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

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

Calculation and experimental test of the cooling factor of tungsten

Iso-nuclear tungsten dielectronic recombination rates for use in magnetically-confined fusion plasmas

Contact Info

Product

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

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