Recombination of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mrow><mml:mi mathvariant="normal">W</mml:mi></mml:mrow><mml:mrow><mml:mn>19</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>ions with electrons: Absolute rate coefficients from a storage-ring experiment and from theoretical calculations

Badnell, N. R.; Spruck, K.; Krantz, Claude; Novotný, Oldřich; Becker, Andreas; Bernhardt, D.; Grieser, M.; Hahn, Michael; Repnow, R.; Savin, D. W.; Wolf, A.; Müller, A.; Schippers, S.

doi:10.1103/physreva.93.052703

Cited by 22 publications

(32 citation statements)

References 17 publications

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“…This makes it very difficult to calculate cross sections and even more difficult to estimate uncertainties in the calculated results. Experimental benchmarks are of the highest importance as may be seen in recent work for intermediate charge states of tungsten [205,206]. However, in the recent article [207] there is a discussion of uncertainties in calculated rates of dielectronic recombination for S 2+ recombining to S + associated with uncertainties in the autoionizing level positions.…”

Section: B Electron -Atom/ion Collisionsmentioning

confidence: 99%

Uncertainty estimates for theoretical atomic and molecular data

Chung¹,

Braams²,

Bartschat³

et al. 2016

J. Phys. D: Appl. Phys.

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Sources of uncertainty are reviewed for calculated atomic and molecular data that are important for plasma modeling: atomic and molecular structure and cross sections for electron-atom, electron-molecule, and heavy particle collisions. We concentrate on model uncertainties due to approximations to the fundamental many-body quantum mechanical equations and we aim to provide guidelines to estimate uncertainties as a routine part of computations of data for structure and scattering.

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Section: B Electron -Atom/ion Collisionsmentioning

confidence: 99%

Uncertainty estimates for theoretical atomic and molecular data

Chung¹,

Braams²,

Bartschat³

et al. 2016

J. Phys. D: Appl. Phys.

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“…Typically, the ionization stages considered have been for simpler cases where the electron shell is near-or completely filled, however, there are exceptions. To date, the most complex tungsten ions to have been studied are the open-f shell ions W 18+ , W 19+ , and W 20+ (4d 10 4f q , q = 8, 9, 10) by Spruck et al and Badnell et al [15,16,17] using an updated version of autostructure to cope with the large number of levels. A less computationally demanding set of calculations were carried out by Preval et al [13], who also used autostructure to calculate partial and total DR rate coefficients for W 73+ to W 56+ as part of The Tungsten Project.…”

Section: Introductionmentioning

confidence: 99%

Partial and total dielectronic recombination rate coefficients forW73+toW56+

2016

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Dielectronic recombination (DR) is the dominant mode of recombination in magnetically confined fusion plasmas for intermediate to lowcharged 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 continue The Tungsten Project by presenting our calculations for tungsten ions W 55+ to W 38+ . As per our prior calculations for W 73+ to W 56+ , 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 W 46+ 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.

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“…During the past few years, we have conducted and, in part, published our experimental measurements on the four neighbouring open-f -shell charge states W 18+ to W 21+ [26,27,28]. Partly as a result of the newly available experimental data, updated theoretical calculations for a variety of tungsten ions in the range of open d and f sub-shells have emerged.…”

Section: Related Workmentioning

confidence: 99%

“…Partly as a result of the newly available experimental data, updated theoretical calculations for a variety of tungsten ions in the range of open d and f sub-shells have emerged. Besides our own theoretical work [29,28], that we review in Sect. 5, Dzuba et al independently provided innovative theoretical models that could be benchmarked against our measurements [30,31] [32,33,34].…”

Section: Related Workmentioning

confidence: 99%

“…In the reviewed work, electron recombination of four neighbouring charge states in the range of open-fshell tungsten has been measured using the storagering electron target method. So far, we have published detailed discussions of the experiments and data analysis for W 20+ (Schippers et al [26], Badnell et al [29]), W 18+ (Spruck et al [27]), and W 19+ (Badnell et al [28]). For W 21+ , an initial analysis of the experimental data has been provided by Spruck [59], while a dedicated article on that charge state is expected in the near future.…”

Section: Recombination Of Tungsten Ions At the Tsrmentioning

confidence: 99%

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Recombination of open-f-shell tungsten ions

Krantz¹,

Badnell²,

Müller³

et al. 2017

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

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We review experimental and theoretical efforts aimed at a detailed understanding of the recombination of electrons with highly-charged tungsten ions characterised by an open 4f sub-shell. Highly-charged tungsten occurs as a plasma contaminant in ITER-like tokamak experiments, where it acts as an unwanted cooling agent. Modelling of the charge state populations in a plasma requires reliable thermal rate coefficients for charge-changing electron collisions. The electron recombination of medium-charged tungsten species with open 4f sub-shells is especially challenging to compute reliably. Storage-ring experiments have been conducted that yielded recombination rate coefficients at high energy resolution and well-understood systematics. Significant deviations compared to simplified, but prevalent, computational models have been found. A new class of ab-initio numerical calculations has been developed that provides reliable predictions of the total plasma recombination rate coefficients for these ions.

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Recombination ofW19+ions with electrons: Absolute rate coefficients from a storage-ring experiment and from theoretical calculations

Cited by 22 publications

References 17 publications

Uncertainty estimates for theoretical atomic and molecular data

Uncertainty estimates for theoretical atomic and molecular data

Partial and total dielectronic recombination rate coefficients forW73+toW56+

Recombination of open-f-shell tungsten ions

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