Abstract
Helium (He) transport and behavior have been investigated during ELMy (edge-localized mode) H-mode using a helium beam in JT-60U. Helium transport coefficients in the ELMy H-mode plasmas ( H = 1.5) are found to be D A = 1–2 m 2/s and C V = 1.0–1.5 when a neutral beam of 60 keV helium atoms is used for a source of central fuelling, and D A = 1 m 2/s and C V = 1.0–1.5 when a short pulse He gas puff is used as peripheral fuelling. No helium accumulation is observed during ELMy H-mode. The behavior of helium in the divertor region has been studied with divertor spectroscopic measurement and compared with that in the main plasma. The He recycling flux in the divertor during ELMy H-mode is about one order of magnitude less than during L-mode with the same level of He gas fuelling.
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