Plasma and Fusion Research

Volume 6, 2402060 (2011)

Regular Articles

Fe14+ and Fe15+ Spatial Distributions in a LHD Plasma Reconstructed from Multiple-Viewing-Chord EUV-Emission Observation
Jun YANAGIBAYASHI, Motoshi GOTO1), Chunfeng DONG1), Shigeru MORITA1) and Masahiro HASUO
Department of Mechanical Engineering and Science, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
1)
National Institute for Fusion Science, Toki 509-5292, Japan
(Received 22 December 2010 / Accepted 31 January 2011 / Published 1 July 2011)

Abstract

We have observed Fe14+ (3s2 1S0 - 3s3p 1P1) and Fe15+ (3s 2S1/2 - 3p 2P3/2) emissions from a LHD plasma with a space-resolved extreme-ultraviolet spectrometer. The observed intensity distributions against the viewing chord for the respective emissions are reconstructed to the emission flux distributions in the plasma against the normalized radius of the poloidal cross section with a maximum entropy method. Both of the emissions localize in the periphery region, and the Fe14+ emission is located outer side than that of Fe15+. We calculate the charge state distribution of Fe ions against the normalized radius assuming the ionization equilibrium at the electron temperature and density, which are measured by a Thomson scattering method. The calculated result is consistent with the experimental one.

Keywords

highly charged ion, impurity, iron, EUV spectrum, spatial distribution, LHD plasma, periphery plasma

DOI: 10.1585/pfr.6.2402060

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This paper may be cited as follows:

Jun YANAGIBAYASHI, Motoshi GOTO, Chunfeng DONG, Shigeru MORITA and Masahiro HASUO, Plasma Fusion Res. 6, 2402060 (2011).