Abstract
We measured time-dependent extreme ultraviolet spectra to carry out a quantitative study of impurity spectral lines of C V in the Large Helical Device (LHD) at the National Institute for Fusion Science. In order to analyze these C V spectra, we calculated the intensity ratios of spectral lines of C V using our collisional-radiative model and compared the results to observed time-dependent intensity ratios. We derived the electron temperature from the measured intensity ratio and estimated the location of the C V emitting region by comparing the derived temperature with the electron temperature distribution measured by the Thomson scattering. Through the C V emitting region, we see that the C V appears just after carbon pellet ablation caused by the bulk plasma at 2.8 s and moves toward the wall until ∼3.0 s.
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