Recent Progress on Identifications of Spectral Lines from Tungsten Ions in Low and High Ionization Stages Using Laboratory Plasmas for Fusion Research and Its Application to Plasma Diagnostics

Morita, S.; Dong, Chuanfei; Kato, Daiji; Oishi, Tetsutarou; Zhang, L.; Fujii, Keisuke; Goto, M.; Hasuo, Masahiro; Kawamoto, Yasuko; Murakami, Izumi; Nakamura, Nobuyuki; Sakaue, Hiroyuki

doi:10.1007/978-981-16-7691-8_2

Cited by 2 publications

(1 citation statement)

References 21 publications

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“…Fei et al [37] deals on Cd-like W XXVII. Most of the works on W HCI are also related to spectroscopic diagnostics of tokamak plasmas [38], e.g. [39].…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical Ritz–Rydberg analysis of the electronic structure of highly charged ions of lead and bismuth by optical spectroscopy

Rosner,

Rehbehn,

Crespo López-Urrutia

2024

J. Phys. B: At. Mol. Opt. Phys.

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Intra-configuration fine-structure transitions in highly charged ions(HCI) result in most cases from changes in the coupling of equivalent electrons.They are multipole forbidden to varying degrees and often occur within the opticalrange. In HCI with semi-filled nd and nf subshells, electrons can in principlecouple to states which are energetically close but with very different total angularmomenta, e.g. 0 ≤ J ≤ 10. This gives rise to metastable states with verylong lifetimes that exhibit particularly interesting clock transitions or, as in thecase of orbital level crossings, acquire a considerable sensitivity to a possiblevariation of the fine-structure constant α. We investigate both experimentallyand theoretically connecting the ground state and adjacent states of Pb XXIIto Pb XXXIV and Bi X to Bi XV, respectively, covering complex couplings ofelectrons in the 4f and 5d shells. These and others such as nd and nf , whichalso contain equivalent electrons, are of interest for frequency metrology usingquantum logic spectroscopy, for atomic structure and QED theory tests, and forthe search for Dark Matter candidates. We infer their level structure, benchmarkcalculations from two different electronic structure codes, and lay the groundworkfor inferring the wavelengths of forbidden transitions of higher multipolarity inthe optical and VUV region.

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“…Fei et al [37] deals on Cd-like W XXVII. Most of the works on W HCI are also related to spectroscopic diagnostics of tokamak plasmas [38], e.g. [39].…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical Ritz–Rydberg analysis of the electronic structure of highly charged ions of lead and bismuth by optical spectroscopy

Rosner,

Rehbehn,

Crespo López-Urrutia

2024

J. Phys. B: At. Mol. Opt. Phys.

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EUV spectral shape variation of tungsten unresolved transition arrays in electron temperature range of 2–4 keV observed in the Large Helical Device

Oishi

Morita

Murakami

et al. 2023

J. Phys.: Conf. Ser.

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Spectroscopic studies of emissions released from tungsten ions combined with a pellet injection technique have been conducted in the Large Helical Device. The tungsten Unresolved Transition Array (UTA) spectrum was observed in the wavelength ranges of extreme ultraviolet (EUV) 6–60 Å and 130–340 Å, and the electron temperature dependence of the UTA spectral shape was investigated in the electron temperature region < 4.3 keV. The UTAs of W24+–W33+ at 20–33 Å, W37+–W42+ at 45–47 Å, W27+–W29+ at 48–55 Å, and W7+– W27+ at 170–210 Å were observed. Unidentified UTAs were also found at 230–270 Å and 280–320 Å. As the electron temperature increased further above 4 keV, the W37+–W42+ UTA at 45–47 Å was maintained, while the other UTAs became less intense.

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Recent Progress on Identifications of Spectral Lines from Tungsten Ions in Low and High Ionization Stages Using Laboratory Plasmas for Fusion Research and Its Application to Plasma Diagnostics

Cited by 2 publications

References 21 publications

Experimental and theoretical Ritz–Rydberg analysis of the electronic structure of highly charged ions of lead and bismuth by optical spectroscopy

Experimental and theoretical Ritz–Rydberg analysis of the electronic structure of highly charged ions of lead and bismuth by optical spectroscopy

EUV spectral shape variation of tungsten unresolved transition arrays in electron temperature range of 2–4 keV observed in the Large Helical Device

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