Recombination of open-f-shell tungsten ions

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.

arXiv commentThis is an author-created, un-copyedited version of an article published in Journal of Physics B: Atomic, Molecular and Optical Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-6455/aa547d

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Cited by in corpus (5)

• Dielectronic recombination of lanthanide and low ionization state tungsten ions: W${}^{13+}$ - W${}^{1+}$
• Electron-impact single ionisation of W${}^{q+}$ ions: Experiment and theory for $11\le \mathbf{q}\le 18$
• Dielectronic recombination of the open $4d$-shell of Tungsten: W${}^{37+}$ - W${}^{28+}$
• Dielectronic resonances of LMn and LNn (n $\ge$ 4) series in highly-charged M-shell tungsten ions
• Dielectronic recombination studies on Fe${}^{2+}$