A multimodal plasma response to applied nonaxisymmetric fields has been found in EAST tokamak plasmas. Here, multimodal means the radial and poloidal structure of an individually driven toroidal harmonic is not fixed. The signature of such a multimodal response is the magnetic polarization (ratio of radial and poloidal components) of the plasma response field measured on the low field side device midplane. A difference in the 3D coil phasing (the relative phase of two coil arrays) dependencies between the two responses is observed in response to n=2 fields in the same plasma for which the n=1 responses are well synchronized.more »
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Hybrid simulations with the global kineticmagnetohydrodynamic (MHD) code M3DK have been carried out to investigate the linear stability and nonlinear dynamics of beamdriven fishbone in the experimental advanced superconducting tokamak (EAST) experiment. Linear simulations show that a low frequency fishbone instability is excited at experimental value of beam ion pressure. The mode is mainly driven by low energy beam ions via precessional resonance. Our results are consistent with the experimental measurement with respect to mode frequency and mode structure. When the beam ion pressure is increased to exceed a critical value, the low frequency mode transits to a betainduced Alfvenmore »

The latest BOUT++ studies show an emerging understanding of dynamics of edge localized mode(ELM) crashes and the consistent collisionality scaling of ELMenergy losses with the world multitokamak database. A series of BOUT++ simulations are conducted to investigate the scaling characteristics of the ELMenergy losses vs collisionality via a density scan. Moreover, the linear results demonstrate that as the pedestal collisionality decreases, the growth rate of the peelingballooning modes decreases for high n but increases for low n (1 < n < 5), therefore the width of the growth rate spectrum γ(n) becomes narrower and the peak growth shifts to lowermore »Cited by 8Full Text Available
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