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Chin. Phys. B, 2015, Vol. 24(11): 115204    DOI: 10.1088/1674-1056/24/11/115204
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES Prev   Next  

Simulations of the L–H transition dynamics with different heat and particle sources

Li Hui-Dong (李会东)a, Wang Zhan-Hui (王占辉)b, Jan Weilandc, Feng Hao (冯灏)a, Sun Wei-Guo (孙卫国)a d
a School of Science, Research Center for Advanced Computation, Xihua University, Chengdu 610039, China;
b Southwestern Institute of Physics, Chengdu 610041, China;
c Department Applied Physics, Chalmers. University of Technology and Euratom-VR Association, S41296 Gothenburg, Sweden;
d Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
Abstract  It is crucial to increase the total stored energy by realizing the transition from a low confinement (L-mode) state to a high confinement (H-mode) state in magnetic confinement fusion. The L-H transition process is simulated by using the predictive transport code based on Weiland’s fluid model. Based on the equilibrium parameters obtained from equilibrium fitting (EFIT) in the experiment, the electron density ne, electron temperature Te, ion temperatures Ti, ion poloidal Vp, and toroidal momenta Vt are simulated self-consistently. The L-H transition dynamic behaviors with the formation of the transport barriers of ion and electron temperatures, the electron density, and the ion toroidal momenta are analyzed. During the L-H transition, the strong poloidal flow shear in the edge transport barrier region is observed. The crashes of the electron and ion temperature pedestals are also observed during the L-H transition. The effects of the heating and particle sources on the L-H transition process are studied systematically, and the critical power threshold of the L-H transition is also found.
Keywords:  magnetic fusion      tokamak plasma      L-H transition      transport barriers  
Received:  02 April 2015      Revised:  22 July 2015      Accepted manuscript online: 
PACS:  52.35.Py (Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.))  
  52.70.La (X-ray and γ-ray measurements)  
  52.55.Tn (Ideal and resistive MHD modes; kinetic modes)  
  52.55.Fa (Tokamaks, spherical tokamaks)  
Fund: Project supported by the Funds of the Youth Innovation Team of Science and Technology in Sichuan Province, China (Grant No. 2014TD0023), the National Natural Science Foundation of China (Grant Nos. 11447228 and 11205053), and the China National Magnetic Confinement Fusion Science Program (Grant No. 2013GB107001).
Corresponding Authors:  Wang Zhan-Hui, Feng Hao     E-mail:  zhwang@swip.ac.cn;fenghao@mail.xhu.edu.cn

Cite this article: 

Li Hui-Dong (李会东), Wang Zhan-Hui (王占辉), Jan Weiland, Feng Hao (冯灏), Sun Wei-Guo (孙卫国) Simulations of the L–H transition dynamics with different heat and particle sources 2015 Chin. Phys. B 24 115204

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