Abstract
From the intensity ratios of the three He I lines measured at 20 kHz, the temporal evolutions of the electron temperature and density during and after the power and the particle flow into the divertor plasma caused by edge localized modes are determined. The electron temperature increases from 70 eV to 80 eV with increasing Dα intensity. Then, at the peak of Dα intensity, the electron temperature starts decreasing down to 60 eV. The electron density increases from 0.1 × 1019 m−3 to 0.3 × 1019 m−3 with increasing Dα intensity, and then starts to decrease more gradually compared with the electron temperature after the peak of Dα intensity. It is interpreted that the increase of the electron temperature is ascribed to the power and the particle flow into the divertor plasma, and that the decrease of the electron temperature and the increase of the electron density are ascribed to the ionization of the recycled neutrals, which consumes the electron energy and produces electrons.
Published Version
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