Experimental Evidence of Nonlinear Avalanche Dynamics of Energetic Particle Modes
L. M. Yu,
F. Zonca,
Z. Y. Qiu
et al.
Abstract:Recent observations in HL-2A tokamak give new experimental evidences of energetic particle mode (EPM) avalanche. In a strong EPM burst, the mode structure propagates radially outward within two hundred Alfvén time, while the frequency of the dominant mode changes self-consistently to maximize wave-particle power exchange and mode growth. This suggests that significant energetic particle transport occurs in this avalanche phase, in agreement with theoretical framework of EPM convective amplification. A simplifi… Show more
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