抄録
Tungsten (W) spectroscopy has attracted significant attention because W is one of the major impurities in ITER and future DEMO reactors. W22+–W33+ spectra at 15–45 Å have been useful for impurity diagnostics. Unresolved Transition Array (UTA) spectra around 200 Å, which contain W17+–W23+, have potential for diagnostics tungsten ions in even lower charge states. Because multiple charge states overlap with very similar wavelengths, it is challenging to evaluate impurity spatial profiles from UTA spectra around 200 Å. In this study, we conducted tungsten pellet injection experiments in Large Helical Device (LHD) and attempted to evaluate the spatial profiles of UTA spectra around 200 Å, observed at 0.3–0.8 keV of central electron temperature. The results indicated that tungsten ions around W20+ were locally profiled in a radial region, reff = 0.38 m, where the local electron temperature decreases by 30% to 40% with respect to more central and outer temperatures. These results suggested that the UTA spectrum around 200 Å would be useful for diagnostics of tungsten impurities in lower charge states than the charge states contained in UTA spectra around 15–45 Å.
本文言語 | 英語 |
---|---|
論文番号 | 21 |
ジャーナル | Atoms |
巻 | 13 |
号 | 2 |
DOI | |
出版ステータス | 出版済み - 2025/02 |
ASJC Scopus 主題領域
- 原子分子物理学および光学
- 核物理学および高エネルギー物理学
- 凝縮系物理学