Time: 2012-06-06 13:00:00
Speaker: Wei Shen, Junhui Zhang [IFTS]
Place: Rm. 413, Bld. 11#, Yuquan Campus
Abstract:
Speaker: Wei Shen
Title: M3D-K Simulations of Sawteeth and Energetic Particles Transport in Tokamaks
Abstract: Nonlinear simulations of Sawteeth and energetic particle transport are carried out using the kinetic/MHD hybrid code M3D-K. MHD simulations show repeated sawtooth cycles due to a resistive (1,1) internal kink mode for a model tokamak equilibrium with a broader pressure profile. However, sawteeth do not occur for a peaked pressure profile. In this case, a steady state saturated (1,1) mode follows the initial sawtooth crash. Furthermore, test particle simulations are carried out to study the energetic particle transport due to a sawtooth crash. The results show that energetic particle distribution is flattened depending on pitch angle and energy. For trapped particles, the redistribution occurs for particle energy below a critical value in agreement with previous theory.