Speaker
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See full abstract here
http://ocs.ciemat.es/EPS2019ABS/pdf/P4.1037.pdf
Improved H mode operation has been achieved on EAST with high using NBI and LHW. Better confinement was obtained with flat central safty factor q profile in the core area, and the minimum q is slight above unity contributing to sawteeth free plasma. Core magnetic fluctuation and current profile dynamics are provided by the 11 chords polarimeter-interferometer measurement. Current profile evloution shows that anomalous current transport exists during transition to improved H mode phase. The characteristics of internal MHD modes evolution are analyzed spatially and temporally. It is infered that nonlinear coupling among different MHD modes may play a important role for sustained flat q profile operation by correlation analysis. Results from other internal diagnostic systems, such as ECE and SXR, also show consistent phenomena.
