Nonlinear dynamics of toroidal Alfven eigenmodes in the presence of tearing modes

作者：Zhu, J.; Ma, Z. W.^*; Wang, S.; Zhang, W.

来源：Nuclear Fusion, 2018, 58(4): 046019.

DOI：10.1088/1741-4326/aaae7e

• frequency chirping
• TAE
• energetic particles
• tearing mode
• hybrid simulation
• phase space structure

A hybrid simulation is carried out to study nonlinear dynamics of n = 1 toroidal Alfven eigenmodes (TAEs) with the m/n = 2/1 tearing mode. It is found that the n = 1 TAE is first excited by isotropic energetic particles at the linear stage and reaches the first steady state due to wave-particle interaction. After the saturation of the n = 1 TAE, the m/n = 2/1 tearing mode grows continuously and reaches its steady state due to nonlinear mode-mode coupling, especially, the n = 0 component plays a very important role in the tearing mode saturation. The results suggest that the enhancement of the tearing mode activity with increase of the resistivity could weaken the TAE frequency chirping through the interaction between the p = 1 TAE resonance and the p = 2 tearing mode resonance for passing particles in the phase space, which is opposite to the classical physical picture of the TAE frequency chirping that is enhanced with dissipation increase.

• 出版日期2018-4
• 单位浙江大学