Plasma and Fusion Research
Volume 20, 2402009 (2025)
Regular Articles
- 1)
- Department of Quantum Science and Energy Engineering, Tohoku University, 6-6-01-2 Aobayama, Sendai 980-8579, Japan
- 2)
- National Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
- 3)
- Graduate Institute for Advanced Studies, SOKENDAI, 322-6 Oroshi-cho, Toki 509-5292, Japan
- 4)
- Interdisciplinary Graduate School of Engineering and Sciences, Kyushu University, Kasuga 816-8580, Japan
- 5)
- Institute for Laser Science, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu 182-8585, Japan
Abstract
Spectroscopic studies of emissions released from tungsten ions combined with a pellet injection technique have been conducted in the Large Helical Device for contribution to the tungsten transport study in tungsten divertor fusion devices and for expansion of the experimental database of tungsten line emissions. Emission lines were explored for the observation of low to intermediate charge states in the range of W10+ to W20+, and the line spectra of W13+ were observed for the first time in fusion plasma experiments. The wavelengths of the observed W13+ lines were 243.1 Å, 247.6 Å, 248.3 Å, and 249.1Å in the extreme ultraviolet wavelength range, and all of them were emission from the 4f 135s2 - 4f 135s5p transitions.
Keywords
plasma spectroscopy, extreme ultraviolet, magnetically confined fusion, impurity transport, tungsten ions in low charge states
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