Impact of Sheath Boundary Conditions and Magnetic Flutter on Evolution and Distribution of Transient Particle and Heat Fluxes in the Edge-Localized Mode Burst by Experimental Advanced Superconducting Tokamak Simulation
Yan-Bin Wu1,2,3, Tian-Yang Xia3**, Fang-Chuan Zhong1**, Bin Gui3, EAST Team
1College of Science, Donghua University, Shanghai 201620 2School of Physics and Electronic Engineering, Anqing Normal University, Anqing 246133 3Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031
Abstract:To study the evolution and distribution of the transient particle and heat fluxes during the edge-localized modes (ELMs) burst on the experimental advanced superconducting tokamak (EAST), the BOUT$^{++}$ six-field two-fluid model with sheath boundary conditions (SBCs) and magnetic flutter terms in the parallel thermal conduction is used to simulate the evolution of the profiles and growing process of the fluxes at divertor targets. Although SBCs hardly play a role in the linear phase, in the nonlinear phase both SBCs and magnetic flutter can change the dominant toroidal mode. SBCs are able to broaden the frequency distribution of the turbulence. The magnetic flutter increases the ELM size from 2.8% to 8.4%, and it doubles the amplitudes of the radial heat and particle transport coefficients at outer midplane (OMP), at around 1.0 m$^{2}$s$^{-1}$. It is then able to increase the particle and heat flux at the divertor targets and to broaden the radial distribution of the parallel heat flux towards the targets.
. [J]. 中国物理快报, 2019, 36(4): 45201-.
Yan-Bin Wu, Tian-Yang Xia, Fang-Chuan Zhong, Bin Gui, EAST Team. Impact of Sheath Boundary Conditions and Magnetic Flutter on Evolution and Distribution of Transient Particle and Heat Fluxes in the Edge-Localized Mode Burst by Experimental Advanced Superconducting Tokamak Simulation. Chin. Phys. Lett., 2019, 36(4): 45201-.
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