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Atoms 2018, 6(2), 34; https://doi.org/10.3390/atoms6020034

Spatially-Resolved Electron Density Measurement in Hydrogen Pellet Ablation Cloud

1
Department of Fusion Science, Sokendai, Toki 509-5292, Japan
2
National Institute for Fusion Science, Toki 509-5292, Japan
*
Author to whom correspondence should be addressed.
Received: 17 April 2018 / Revised: 11 May 2018 / Accepted: 4 June 2018 / Published: 11 June 2018
(This article belongs to the Section Atomic, Molecular and Nuclear Spectroscopy and Collisions)
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Abstract

A spectroscopic method for spatial resolution measurement in fuel pellet ablation clouds is being developed in the Large Helical Device (LHD). Spatial resolution is obtained thanks to optics that have a narrow, band-shaped field-of-view. The Stark-broadened Hβ emission line of a deuterium pellet ablation cloud is isolated and analyzed with a spectral lineshape code. The electron density profile of the ablation cloud along its direction of elongation is derived through least squares fitting. The obtained profile is peaked and has a dip at its center which confirms what can be found in simulations. Moreover, the order of magnitudes for the derived electron densities are in agreement with what has already been found in the LHD. View Full-Text
Keywords: plasma fusion; diagnostics; plasma spectroscopy; spatial resolution measurement; fuel pellet injection; ablation cloud; electron density plasma fusion; diagnostics; plasma spectroscopy; spatial resolution measurement; fuel pellet injection; ablation cloud; electron density
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Seguineaud, G.; Motojima, G.; Narushima, Y.; Goto, M. Spatially-Resolved Electron Density Measurement in Hydrogen Pellet Ablation Cloud. Atoms 2018, 6, 34.

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