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Interpretation of spectral emission around 20 nm region from tungsten ions observed in fusion device plasmas
Date Issued
2011-08-24
Date Available
2012-06-21T15:03:29Z
Abstract
We have measured extreme ultraviolet (EUV) spectra from tungsten ions around 20 nm region in plasmas produced in the Large Helical Device at the National Institute for Fusion Science. The spectra after injecting a tungsten pellet into a hydrogen plasma were monitored by a grazing incidence spectrometer. Quasicontinuum spectral feature arising from unresolved transition array (UTA) was observed around 20 nm region in plasmas with temperatures below 1.0 keV. This structure is reasonably considered to be the same one as those observed in another tokamak device or laser produced plasmas under low temperature conditions. Atomic structure calculations have been performed for tungsten ions with open 5p, 5s and 4f subshells (W7+–W27+) to interpret this commonly observed feature around 20 nm. Wavelengths and gA values for these transitions were calculated, and their mean wavelengths and extent were compared with the observations, which suggests that the emission largely arises from n = 5–5 transitions in stages lower than W27+.
Sponsorship
Science Foundation Ireland
Type of Material
Journal Article
Publisher
Institute of Physics
Journal
Journal of Physics B: Atomic, Molecular and Optical Physics
Volume
44
Issue
17
Copyright (Published Version)
2011 IOP Publishing
Keywords
Subject – LCSH
Ultraviolet spectra
Tungsten
Tokamaks
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
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