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Heat flux and plasma flow in the far scrape off layer (far-SOL) are examined in the inboard poloidal null (IPN) configuration on the spherical tokamak QUEST. High heat flux (> 1 MW/m^2) and super-soni...c flow (M > 1) in far-SOL arise in current ramp-up phase. They are suppressed after closed flux surface is generated. In quasi-steady state with plasma current I_p ≈ 20 kA, sawtooth-like oscillation of I_p with 20 Hz occurs spontaneously. Heat flux and subsonic plasma flow in far-SOL are well correlated to the I_p-oscillation. Limit-cycle characteristic on the M-I_p diagram indicates that there is a close relationship between core and far-SOL in the IPN configuration.続きを見る
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Mendeley出力
