Departmental Bulletin Paper 球状トカマクQUESTのIPN配位における遠方スクレイプオフ層の熱流束とプラズマ流
Observation of heat flux and plasma flow in the far scrape-off layer of the IPN configuration in QUEST

恩地, 拓己

149pp.47 - 50 , 2015-09 , 九州大学応用力学研究所
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-sonic 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.

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