Fe14+ and Fe15+ Spatial Distributions in a LHD Plasma Reconstructed from Multiple-Viewing-Chord EUV-Emission Observation
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We have observed Fe<sup>14+</sup> (3s<sup>2</sup> <sup>1</sup>S<sub>0</sub> - 3s3p <sup>1</sup>P<sub>1</sub>) and Fe<sup>15+</sup> (3s <sup>2</sup>S<sub>1/2</sub> - 3p <sup>2</sup>P<sub>3/2</sub>) 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 Fe<sup>14+</sup> emission is located outer side than that of Fe<sup>15+</sup>. 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.
- Plasma and Fusion Research
Plasma and Fusion Research (6), 2402060-2402060, 2011
The Japan Society of Plasma Science and Nuclear Fusion Research