Dirac R-matrix calculations for the electron-impact excitation of neutral tungsten providing noninvasive diagnostics for magnetic confinement fusion

R. T. Smyth, C. P. Ballance, C. A. Ramsbottom, C. A. Johnson, D. A. Ennis, S. D. Loch

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6 Citations (Scopus)
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Abstract

Neutral tungsten is the primary candidate as a wall material in the divertor region of the International Thermonuclear Experimental Reactor (ITER). The efficient operation of ITER depends heavily on precise atomic physics calculations for the determination of reliable erosion diagnostics, helping to characterise the influx of tungsten impurities into the core plasma. The following paper presents detailed calculations of the atomic structure of neutral tungsten using the multiconfigurational Dirac-Fock method, drawing comparisons with experimental measurements where available, and includes a critical assessment of existing atomic structure data. We investigate the electron-impact excitation of neutral tungsten using the Dirac R-matrix method and, by employing collisional-radiative models, we benchmark our results with recent Compact Toroidal Hybrid measurements. The resulting comparisons highlight alternative diagnostic lines to the widely used 400.88nm line.
Original languageEnglish
Article number052705
JournalPhysical Review A (Atomic, Molecular, and Optical Physics)
Volume97
Issue number5
DOIs
Publication statusPublished - 07 May 2018

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  • Student Theses

    R-matrix calculations in support of diagnostics for fusion and astrophysical plasmas

    Author: Smyth, R., Jul 2020

    Supervisor: Ramsbottom, C. (Supervisor) & Ballance, C. (Supervisor)

    Student thesis: Doctoral ThesisDoctor of Philosophy

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