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Effect of local toroidal flow on double-tearing modes in cylindrical geometry
Authors:Ruibo Zhang  Xingqiang Lu  Wei Guo  Chenyan Yin  Xueyu Gong
Affiliation:1. School of Nuclear Science and Technology, University of South China, Hengyang, China

Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, China;2. School of Nuclear Science and Technology, University of South China, Hengyang, China;3. School of Electrical Engineering, University of South China, Hengyang, China

Abstract:The effect of local toroidal flow (LTF) on double-tearing modes (DTMs) is investigated in cylindrical geometry using the reduced magnetohydrodynamics (RMHD) model. The results indicate that the LTF between the two rational surfaces is the dominant suppression effect on DTMs. The suppression effect is enhanced with the flow width increasing, and the DTMs become more stable with the increase of the shear of the LTF between the two rational surfaces. So, in the reversed shear magnetic field configuration, the local flow is driven between the two rational surfaces, which can effectively suppress the development of DTMs and maintain the high-performance state.
Keywords:double-tearing modes  local toroidal plasma flows  MHD
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