Spatially-Resolved Electron Density Measurement in Hydrogen Pellet Ablation Cloud

Atoms

Guillaume Seguineaud¹  Gen Motojima¹  Motoshi Goto¹  Yoshiro Narushima¹ 

[1] Department of Fusion Science, Sokendai, Toki 509-5292, Japan;

关键词: plasma fusion;    diagnostics;    plasma spectroscopy;    spatial resolution measurement;    fuel pellet injection;    ablation cloud;    electron density;   

DOI  :  10.3390/atoms6020034

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown