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

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【作者】 李会东王占辉Jan Weiland冯灏孙卫国

【Author】 Li Hui-Dong;Wang Zhan-Hui;Jan Weiland;Feng Hao;Sun Wei-Guo;School of Science, Research Center for Advanced Computation, Xihua University;Southwestern Institute of Physics;Department Applied Physics, Chalmers.University of Technology and Euratom-VR Association;Institute of Atomic and Molecular Physics, Sichuan University;

【机构】 School of Science, Research Center for Advanced Computation, Xihua UniversitySouthwestern Institute of PhysicsDepartment Applied Physics, Chalmers.University of Technology and Euratom-VR AssociationInstitute of Atomic and Molecular Physics, Sichuan University

【摘要】 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 n e, electron temperature T e, ion temperatures T i, ion poloidal V p,and toroidal momenta V t 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.

【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 n e, electron temperature T e, ion temperatures T i, ion poloidal V p,and toroidal momenta V t 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.

【基金】 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);the China National Magnetic Confinement Fusion Science Program(Grant No.2013GB107001)
  • 【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2015年11期
  • 【分类号】O53
  • 【被引频次】2
  • 【下载频次】16
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