Multipolar Structure of Equilibrium Shear Flow Field in Toroidal Plasmas |
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Authors: | Liu-Xiu He Ming-Hai Liu Hua-Kun Cai |
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Institution: | 1. School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China;
2. International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, Huazhong University of Science and Technology, Wuhan 430074, China;
3. State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electric Engineering, Huazhong University of Science and Technology, Wuhan 430074, China |
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Abstract: | The multipolar velocity field structures are investigated by 2D momentum conservation equation with 3D equilibrium sheared flows in the full toroidal system. Numerical results show that the non-existence of radial velocity field in equilibrium surfaces is suitable only for the zero-order term of our 2D simulation. The non-zero-order radial velocity field is still preserved, even when converted to conventional magnetic surface coordinates. The distribution of velocity field vectors of the order of 1, 2, and 3 are presented respectively in 2, 4, and 6 polar fields with the local vortex structure. The excitation mechanisms of these velocity vortices are the coupling effects of the magneto-fluid structure patterns and the toroidal effects. These results can help us understand the complexity of core physics, the transverse transport across magnetic field by the radial plasma flow and the formation of velocity vortices. |
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Keywords: | equilibrium shear flow multipolar field vortex structure |
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