Observation of heat flux and plasma flow in the far scrape-off layer of the IPN configuration in QUEST - Collections

＜departmental bulletin paper＞
Observation of heat flux and plasma flow in the far scrape-off layer of the IPN configuration in QUEST

Creator	Author PID K005161 Creator Name 恩地, 拓己 Onchi, Takumi オンチ, タクミ Affiliation Affiliation Name 九州大学応用力学研究所 Research Institute for Applied Mechanics, Kyushu University
Language	Japanese
Publisher	九州大学応用力学研究所
Publisher	Research Institute for Applied Mechanics, Kyushu University
Date	2015-09
Source Title	Reports of Research Institute for Applied Mechanics, Kyushu University
Vol	149
First Page	47
Last Page	50
Publication Type	Version of Record
Access Rights	open access
JaLC DOI	https://doi.org/10.15017/1660017
Abstract	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.show more

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