Recombination of open-f-shell tungsten ions

C Krantz, N R Badnell, A Müller, S Schippers, A Wolf

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

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.
LanguageEnglish
Article number052001
Number of pages11
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume50
Issue number5
Early online date10 Feb 2017
Publication statusPublished - 14 Mar 2017

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tungsten
coefficients
electron recombination
ions
contaminants
electron scattering
deviation
cooling
predictions
electrons
energy

Keywords

  • recombination
  • tungsten
  • plasma

Cite this

Krantz, C., Badnell, N. R., Müller, A., Schippers, S., & Wolf, A. (2017). Recombination of open-f-shell tungsten ions. Journal of Physics B: Atomic, Molecular and Optical Physics, 50(5), [052001].
Krantz, C ; Badnell, N R ; Müller, A ; Schippers, S ; Wolf, A . / Recombination of open-f-shell tungsten ions. In: Journal of Physics B: Atomic, Molecular and Optical Physics. 2017 ; Vol. 50, No. 5.
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Krantz, C, Badnell, NR, Müller, A, Schippers, S & Wolf, A 2017, 'Recombination of open-f-shell tungsten ions' Journal of Physics B: Atomic, Molecular and Optical Physics, vol. 50, no. 5, 052001.

Recombination of open-f-shell tungsten ions. / Krantz, C; Badnell, N R; Müller, A; Schippers, S ; Wolf, A .

In: Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 50, No. 5, 052001, 14.03.2017.

Research output: Contribution to journalArticle

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AB - 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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