Time: 2016-09-29 15:00:00
Speaker: Dr. Zhiyong Qiu [IFTS-ZJU]
Place: Rm. 413, Bld. 11#, Yuquan Campus
Abstract: Title: Nonlinear Zonal Structure Generation by Toroidal Alfven Eigenmode
Abstract: The set of equations describing fully nonlinear evolution of toroidal Alfven eigenmode are derived, including both zero frequency zonal structure (ZFZS) generation and wave-particle phase space nonlinearity. The simplified case neglecting wave-particle phase space nonlinearity is then inves-tigated to focus on different roles of energetic particles and bulk plasmas on ZFZS generation. It is shown that energetic particles and bulk plasma plays dominant role in ZFZS generation in different stage, and the nonlinear process is qualitatively different. Several properties of ZFZS generation, e.g., fine- v.s. meso-scale, forced driven v.s. spontaneous excitation, are clarified.