Abstract
Electron impact excitation of highly charged tungsten ions in the framework of a fully relativistic distorted wave approach is considered in this paper. Calculations of electron impact excitation cross-sections for the M- and L-shell transitions in the tungsten ions Wn+ (n = 44–66) and polarization of the decay of photons from the excited tungsten ions are briefly reviewed and discussed. New calculations in the wide range of incident electron energies are presented for M-shell transitions in the K-like through Ne-like tungsten ions.
Highlights
Special physical properties of tungsten such as its highest melting point and lowest metal pressure amongst metals make it a potential candidate in fusion engineering where tungsten can be used as a potential plasma facing material
Information on the electron impact excitation cross-sections as well as the polarization of the radiation emitted due to decay of the excited state will facilitate a thorough understanding of the spectra for plasma diagnostics
Polarization studies play an important role in understanding the plasma properties, as X-ray polarization spectroscopy is a useful diagnostic tool for measuring the velocity distribution of hot electrons propagating in plasma created with a high intensity laser pulse [4]
Summary
Special physical properties of tungsten such as its highest melting point and lowest metal pressure amongst metals make it a potential candidate in fusion engineering where tungsten can be used as a potential plasma facing material. Information on the electron impact excitation cross-sections as well as the polarization of the radiation emitted due to decay of the excited state will facilitate a thorough understanding of the spectra for plasma diagnostics. There has been interest in the study of emissions from M-shell charged states of tungsten, which will be present in considerable amount in the ITER core under ohmic plasma operations. In this context, we have performed fully relativistic distorted wave (RDW) calculations to obtain cross-sections for various M- and L-shell transitions due to electron impact excitation of highly charged tungsten ions Wn+.
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