Electron-impact excitation data for W 2+ in support of tungsten spectroscopy and re-deposition measurements for magnetically-confined plasmas

McCann, M.; Ballance, C. P.; Loch, S. D.; Ennis, D. A.

doi:10.1088/1361-6455/ad7cad

Title: Electron-impact excitation data for W ²⁺ in support of tungsten spectroscopy and re-deposition measurements for magnetically-confined plasmas

Journal Article · 28 October 2024 · Journal of Physics. B, Atomic, Molecular and Optical Physics

DOI: https://doi.org/10.1088/1361-6455/ad7cad · OSTI ID:2475255

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Abstract To better understand plasma wall interactions involving tungsten, accurate atomic structure and electron-impact driven collisional processes for near-neutral ion stages of tungsten are required. Complementing existing work on neutral and singly ionised tungsten, atomic structure and collisional calculations for W ²⁺ electron-impact excitation have been completed. These excitation calculations are an important component of S/XB coefficients for near-neutral charge states, which may be used to spectroscopically infer re-deposition of tungsten at the plasma-solid boundary of fusion relevant devices. With W ²⁺ in particular having emission lines that can be observed at ultraviolet (UV) wavelengths, while higher charge states of tungsten are unlikely to have lines possible to observe outside of the vacuum UV range. The atomic structure was generated using the General-purpose Relativistic Atomic Structure Package (GRASP ⁰ ), implementing the Multi-configuration Dirac Fock approach. This structure was the basis for a subsequent Dirac R -matrix electron-impact excitation calculation to provide Maxwellian averaged rate coefficients. A synthetic spectrum was generated from this data using a collisional-radiative model to predict the strongest W III spectral lines and these lines were compared to emission from the Compact Toroidal Hybrid (CTH) plasma device. Several of the strongest W III lines are observed in CTH and agree well with the modelled line wavelengths and intensities, a table of these lines is provided that could be observed in other devices.

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Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: FG02-00ER54610

OSTI ID:: 2475255

Journal Information:: Journal of Physics. B, Atomic, Molecular and Optical Physics, Journal Name: Journal of Physics. B, Atomic, Molecular and Optical Physics Journal Issue: 23 Vol. 57; ISSN 0953-4075

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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Title: Electron-impact excitation data for W ²⁺ in support of tungsten spectroscopy and re-deposition measurements for magnetically-confined plasmas