EUV spectra of highly-charged ions W${}^{54+}$-W${}^{63+}$ relevant to ITER diagnostics

Abstract

We report the first measurements and detailed analysis of extreme ultraviolet (EUV) spectra (4 nm to 20 nm) of highly-charged tungsten ions W${}^{54+}$ to W${}^{63+}$ obtained with an electron beam ion trap (EBIT). Collisional-radiative modelling is used to identify strong electric-dipole and magnetic-dipole transitions in all ionization stages. These lines can be used for impurity transport studies and temperature diagnostics in fusion reactors, such as ITER. Identifications of prominent lines from several W ions were confirmed by measurement of isoelectronic EUV spectra of Hf, Ta, and Au. We also discuss the importance of charge exchange recombination for correct description of ionization balance in the EBIT plasma.

11 pages, 4 figures

References in corpus (2)

• Spectra of W${}^{39+}$-W${}^{47+}$ in the 12 nm to 20 nm region observed with an EBIT light source
• Density dependence of the forbidden lines in Ni-like tungsten

Cited by in corpus (11)

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• Benchmarking calculations with spectroscopic accuracy of level energies and wavelengths in W LVII - W LXII tungsten ions
• Theoretical investigation on the soft X-ray spectrum of the highly-charged W${}^{54+}$ ions
• E1, M1, E2 transition energies and probabilities of W${}^{54+}$ ions
• Benchmarking calculations with spectroscopic accuracy of excitation energies and wavelengths in sulfur-like tungsten
• EBIT Observation of Ar Dielectronic Recombination Lines Near the Unknown Faint X-Ray Feature Found in the Stacked Spectrum of Galaxy Clusters
• Dielectronic resonances of LMn and LNn (n $\ge$ 4) series in highly-charged M-shell tungsten ions