Interpretation of EUV spectra in the 20 nm region from tungsten ions observed in the LHD

C. Suzuki, C. S. Harte, D. Kilbane, T. Kato, H. A. Sakaue, I. Murakami, D. Kato, K. Sato, N. Tamura, S. Sudo, M. Goto, R. D'Arcy, E. Sokell, G. O'Sullivan

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Citations (Scopus)

Abstract

We have measured extreme ultraviolet (EUV) spectra in the 20 nm region from tungsten ions in plasmas produced in the Large Helical Device (LHD) at the National Institute for Fusion Science. The spectra are recorded by a grazing incidence spectrometer following an injection of a tungsten pellet. A quasicontinuum feature has been observed in the 20 nm range under low temperature conditions below 1.0 keV, where large contributions of charged states lower than W 27+ are expected. In order to give an insight into this spectral feature, we have carried out atomic structure calculations for W 7+-W 27+ using Cowan's code. The calculated distributions of wavelengths and gA values suggest that the emission largely arises from n = 5-5 transitions in stages lower than W 27+.

Original languageEnglish
Title of host publication17th International Conference on Atomic Processes in Plasmas, ICAPiP
Pages197-200
Number of pages4
DOIs
Publication statusPublished - 2012
Externally publishedYes
Event17th International Conference on Atomic Processes in Plasmas, ICAPiP 2011 - Belfast, United Kingdom
Duration: 19 Jul 201222 Jul 2012

Publication series

NameAIP Conference Proceedings
Volume1438
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference17th International Conference on Atomic Processes in Plasmas, ICAPiP 2011
Country/TerritoryUnited Kingdom
CityBelfast
Period19/07/201222/07/2012

Keywords

  • EUV spectra
  • Highly charged ions
  • ITER
  • LHD
  • Tungsten
  • UTA

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