Plasma and Fusion Research

Volume 19, 1402022 (2024)

Regular Articles

Observation and Identification of W¹⁹⁺-W²³⁺ Spectra in the EUV Wavelength Region in the Vicinity of 200Å

Ryota NISHIMURA, Tetsutarou OISHI, Izumi MURAKAMI^1,2), Daiji KATO^1,3), Hiroyuki A SAKAUE¹⁾, Shivam GUPTA¹⁾, Hayato OHASHI⁴⁾, Motoshi GOTO^1,2), Yasuko KAWAMOTO^1,2), Tomoko KAWATE^1,2), Hiroyuki TAKAHASHI and Kenji TOBITA

: Department of Quantum Science and Energy Engineering, Tohoku University, Sendai 980-8579, Japan
1): National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
2): The Graduate University for Advanced Studies, SOKENDAI, Toki 509-5292, Japan
3): Interdisciplinary Graduate School of Engineering Sciences, Kyusyu University, Kasuga 816-8580, Japan
4): Institute of Liberal Arts and Sciences, University of Toyama, Toyama 930-8555, Japan

(Received 25 April 2024 / Accepted 29 May 2024 / Published 9 July 2024)

Abstract

Tungsten (W) is one of the major impurities in ITER and future DEMO reactors. However, diagnosing ion density, temperature, and spatial distribution for tungsten ions in low charge states such as W¹⁷⁺-W²⁷⁺ is difficult due to a lack of spectral line data. In this study, we observed tungsten Unresolved Transition Array (UTA) spectra around W²⁰⁺ in Large Helical Device. Furthermore, the emission spectra of tungsten ions ranging from W¹⁹⁺-W²³⁺ were also measured using Compact electron Beam Ion Trap (CoBIT). Two spectral peaks were detected in the CoBIT experimental setup. Subsequently, these peaks were theoretically identified as 5s-5p and 5p_3/2-5d transitions using Flexible Atomic Code (FAC). The identified peaks are useful for impurity diagnostics of ITER edge plasma.

Keywords

tungsten spectra, impurity diagnostics, flexible atomic code, LHD, atomic process

DOI: 10.1585/pfr.19.1402022

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