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Characteristics of H-mode-like discharges and ELM activities in the presence of ι/2π = 1 surface at the ergodic layer in LHD

S Morita, T Morisaki, K Tanaka, S Masuzaki, M Goto, S Sakakibara, C Michael, K Narihara, S Ohdachi, R Sakamoto2006年Plasma Physics and Controlled FusionIF 2.2出版社

Magnetic configurations of LHD are characterized by the presence of chaotic magnetic field, the so-called ergodic layer, surrounding the core plasma. H-mode-like discharges have been obtained at an outwardly shifted configuration of Rax = 4.00 m with a thick ergodic layer, where the ι/2π = 1 position is located in the middle of the ergodic layer. A clear density rise and a reduction of magnetic fluctuation were observed. ELM-like Hα bursts also appeared with a radial propagation of density bursts. These H-mode-like discharges can be triggered by changing PNBI(<12 MW) from three beams to two beams in a density range (4–8) × 1013 cm−3. The ELM-like bursts vanished with a small change of the edge rotational transform. A precise profile measurement of the edge density bursts confirmed that ELM-like bursts occur at the ι/2π = 1 position.

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Edge localized modeH-modeLHD
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