Plasma and Fusion Research

Volume 16, 2402006 (2021)

Regular Articles

EUV and VUV Spectra of NeIII-NeX Line Emissions Observed in the Impurity Gas-Puffing Experiments of the Large Helical Device

Tetsutarou OISHI^1,2), Shigeru MORITA^1,2), Masahiro KOBAYASHI^1,2), Kiyofumi MUKAI^1,2), Gakushi KAWAMURA^1,2), Suguru MASUZAKI^1,2), Yuki HAYASHI¹⁾, Chihiro SUZUKI^1,2), Yasuko KAWAMOTO¹⁾, Motoshi GOTO^1,2) and the LHD Experiment Group¹⁾

1): National Institute for Fusion Science, National Institutes of Natural Sciences, 322-6 Toki, Gifu 509-5292, Japan
2): The Graduate University for Advanced Studies, SOKENDAI, 322-6 Toki, Gifu 509-5292, Japan

(Received 9 November 2020 / Accepted 16 December 2020 / Published 10 February 2021)

Abstract

Extreme ultraviolet (EUV) and vacuum ultraviolet (VUV) wavelength spectra including line emissions released from neon (Ne) ions ranging from low to high charge states observed simultaneously in a single discharge are summarized for contribution to compile a fundamental spectral dataset for the Ne-seeded divertor heat load reduction experiments in Large Helical Device (LHD). NeIX and NeX lines were observed in the EUV wavelength range of 10∼50 Å and NeIII-NeVIII lines were observed in the VUV wavelength range of 400∼1000 Å. The temporal evolutions of the line intensities exhibited different behaviors between the edge emissions of NeIII-NeVIII with the ionization potential, E_i, of 63∼239 eV and the core emission of NeX with E_i of 1362 eV. NeIX with E_i of 1196 eV exhibited a marginal behavior between the edge emission and the core emission.

Keywords

plasma spectroscopy, extreme ultraviolet, vacuum ultraviolet, magnetically confined fusion, impurity seeding, divertor detachment

DOI: 10.1585/pfr.16.2402006

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