Recombination of open-f-shell tungsten ions

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

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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.
Original 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

Keywords

  • recombination
  • tungsten
  • plasma

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