Quantitative analysis on tungsten spectra of W6+ to W45+ ions. (July 2019)

• Record Type: Journal Article
• Authors: Morita, S.; Dong, C.F.; Kato, D.; Liu, Y.; Zhang, L.; Cui, Z.Y.; Goto, M.; Kawamoto, Y.; Murakami, I.; Oishi, T.
• Is Part Of: Journal of physics. Volume 1298(2019)
• Publication Date: 2019-07
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/1289/1/012005
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: Tungsten ion densities are determined by measuring radial profiles of line emissions in LHD. Zn-(W 44+ ) and Cu-like (W 45+ ) ion densities are determined from line emission at 60.9 Å and 127.0 Å, respectively. Ion densities of W 24+, W 25+ and W 26+ are also determined from tungsten pseudo-continuum (a so-called unresolved transition array (UTA)) at 29-33 Å. Observations of magnetic dipole (M1) forbidden lines at 3377Å enable evaluation of the ion density of W 27+ . In EAST tokamak the tungsten concentration is estimated by a combination of the UTA and total radiation loss. In HL-2A the tungsten influx is evaluated from line emission of W 6+ ions at 216.2 Å and 261.4 Å, which are measured during the tungsten reappearance phase after tungsten laser blow-off. All these results demonstrate a good approach towards quantitative tungsten analysis.