Simulations of heat fluxes in an ELMy H-mode discharge on HL-2A
X. X. He,
T. Y. Xia,
Z. H. Wang,
T. F. Tang,
X. Q. Xu,
J. M. Gao,
Y. Q. Huang,
Y. B. Wu,
Z. C. Yang,
Y. Liu
Affiliations
X. X. He
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian 116024, China
T. Y. Xia
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
Z. H. Wang
Southwestern Institute of Physics, Chengdu 610041, People’s Republic of China
T. F. Tang
College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
X. Q. Xu
Lawrence Livermore National Laboratory, Livermore, California 94550, USA
J. M. Gao
Southwestern Institute of Physics, Chengdu 610041, People’s Republic of China
Y. Q. Huang
Hengyang Normal University, Hengyang 421002, People’s Republic of China
Y. B. Wu
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
Z. C. Yang
Southwestern Institute of Physics, Chengdu 610041, People’s Republic of China
Y. Liu
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Physics, Dalian University of Technology, Dalian 116024, China
In order to study the distribution and evolution of the transient heat flux on HL-2A during edge-localized-mode (ELM) bursts, the BOUT++ electromagnetic six-field two-fluid model is used to simulate the pedestal collapse under the lower single-null divertor geometry. The equilibrium profiles of HL-2A ELMy H-mode discharge No. 24 953 are adopted as the initial condition in the original case. In this case, linear analysis shows that the resistive ballooning mode (RBM) and drift-Alfven wave are unstable to this equilibrium, and RBM is the dominant instability. The evolutions of the radial heat fluxes at the outer mid-plane and heat fluxes to the inner and outer targets during the ELM event are presented. Six more equilibria are constructed based on the original case to find out the influence of the pedestal profiles on the peak electron heat flux. The results indicate that the heat flux increases with temperature and/or density, and the theoretical analysis and simulation results consistently show that the heat flux q∥e is proportional to ne0,SEPTe0,SEP32.
