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Temporal evolutions of electron temperature and density with edge localized mode in the JT-60U divertor plasma

Nakano, Tomohide; Kubo, Hirotaka; Asakura, Nobuyuki

The temporal evolutions of the electron temperature and density with ELM, determined from intensity ratios of the three He I lines measured at 20 kHz, start to increase 450 $$mu$$s before the peak of $$mbox{D}_alpha$$ intensity, which is an ELM indicator. At the peak of $$mbox{D}_alpha$$ intensity, the electron temperature starts to decrease while the electron density starts to decrease in 300 $$mu$$s. The temporal evolution of the electron temperature is ascribed to heating by the ELM plasma and to energy loss for ionization of recycled neutrals, and that of the electron density is ascribed to electrons supplied in the ionization of the neutrals.

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