Time: 2017-03-16 14:00:00
Speaker: Jia ZHU [IFTS-ZJU]
Abstract: Time: Thursday, Mar. 16, 02:00 pm
Venue: Rm. 413, Bld. 11#, Yuquan Campus
Title：Nonlinear dynamics of toroidal Alfvén eigenmodes in presence of tearing modes
Speaker: Jia Zhu (祝佳)
Abstract：A hybrid simulation is carried out to study nonlinear dynamics of n = 1 toroidal Alfvén eigenmodes(TAEs) with the m, n=2, 1 tearing mode(TM) evolved. It is found that n = 1 TAE is 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 mode continuously grows and reaches second steady state due to multiple tearing mode-mode nonlinear coupling, especially, the n = 0 component plays a very important role in tearing mode saturation. Furthermore, strong low frequency tearing mode activities make the TAE frequency chirping structure weak due to tearing mode resonances spreading in phase space.