Instantaneous Correlation between ELM-like MHD Activity and Abrupt Non-local Reduction of Transport at Internal Transport Barrier Formation in JT-60U High-β_p Plasmas

概要

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Transport evolution in normal and reversed shear JT-60U tokamak plasmas with internal transport barrier (ITB) often occurs via non-local transport bifurcations. In the present paper, we highlight new type of edge-core instantaneous interplay in JT-60U high-βp plasmas. Abrupt in time (ms timescale) and wide in space (˜0.4 of minor radius) reduction of electron heat flux in the core (ITB-event) is correlated in ms timescale with the start of an ELM that creates enhanced level of Hα. This result gives a hint of the control to form the ITB immediately and non-locally by inducing the ELM-like MHD activity.
プラズマ・核融合学会の論文
2003-12-25