The spectrum of seven times ionized tungsten (W VIII) relevant to tokamak divertor plasmas

Tungsten spectra excited in the vacuum sparks of different setups and electric circuits were recorded on two high-resolution vacuum spectrographs. For the region 190-500 Å, a 10 m normal incidence spectrograph with a 3600 lines mm grating was used in the Meudon Observatory. In the region below 350 Å...

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Bibliographic Details
Published in:Physica scripta 2013-04, Vol.87 (4), p.45303-13
Main Authors: Ryabtsev, A N, Kononov, E Ya, Kildiyarova, R R, Tchang-Brillet, W-Ü L, Wyart, J-F
Format: Article
Language:English
Subjects:
Astrophysics
Diffraction gratings
Excitation
Gratings (spectra)
Physics
Plasmas
Spectra
Spectrographs
Tokamak devices
Tungsten
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Summary:Tungsten spectra excited in the vacuum sparks of different setups and electric circuits were recorded on two high-resolution vacuum spectrographs. For the region 190-500 Å, a 10 m normal incidence spectrograph with a 3600 lines mm grating was used in the Meudon Observatory. In the region below 350 Å, a set of spectra was produced using a 3 m grazing incidence spectrograph with a 3600 lines mm grating in the Institute of Spectroscopy in Troitsk. A total of 187 lines in the region 160-271 Å were identified as transitions to the low-lying odd configurations 4f135s25p6 and 4f145s25p5 from the interacting excited even 4f125s25p65d + 4f135s25p5(5d + 6s) + 4f145s25p4(5d + 6s) + 4f145s5p6 configurations. It was found that 4f135s25p6 2F7 2 is the ground level of W VIII. The fine structure splitting and relative positions of the odd terms were established, and 98 levels of the excited even configurations were found.
ISSN:0031-8949
1402-4896
DOI:10.1088/0031-8949/87/04/045303