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Multiscale interaction between the magnetic island and turbulence has beendemonstrated through simultaneous two-dimensional measurements of turbulenceand temperature and flow profiles. The magnetic island and turbulence mutuallyinteract via the coupling between the electron temperature ($T_e$) gradient,the $T_e$ turbulence, and the poloidal flow. The $T_e$ gradient altered by themagnetic island is peaked outside and flattened inside the island. The $T_e$turbulence can appear in the increased $T_e$ gradient regions. The combinedeffects of the $T_e$ gradient and the the poloidal flow shear determinetwo-dimensional distribution of the $T_e$ turbulence. When the reversedpoloidal flow forms, it can maintain the steepest $T_e$ gradient and themagnetic island acts more like a electron heat transport barrier.Interestingly, when the $T_e$ gradient, the $T_e$ turbulence, and the flowshear increase beyond critical levels, the magnetic island turns into a fastelectron heat transport channel, which directly leads to the minor disruption.

Multiscale interaction between a large scale magnetic island and small scale turbulence