Abstract
Experiments with different directions of toroidal magnetic fields were performed on the EAST tokamak. The sawtooth behavior has been investigated in both ohmical and LHCD–ICRF plasmas (lower hybrid current drive and ion-cyclotron radio frequency). It is found that the magnetic configuration only has a negligible effect on sawtooth behavior. Sawtooth periods changed dramatically in the LHCD–ICRF plasma where the direction of electron diamagnetic drift velocity was inversed. The rotation directions of sawtooth precursor reversed when the direction of the toroidal magnetic field was changed. We also found that the period of sawtooth depends on the stability, including linear growth and nonlinear evolution, of the sawtooth precursor. Finally, we propose that the longer sawtooth is due to the stabilized internal modes, which stabilize by energetic ions produced by ICRF.
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