关键词: q剖面/
旋转剖面/
撕裂模不稳定性/
Kelvin-Helmholtz不稳定性
English Abstract
Excitations of tearing mode and Kelvin-Helmholtz mode in rotating cylindrical plasmas
Bi Hai-Liang1,2,Wei Lai1,
Fan Dong-Mei1,
Zheng Shu1,
Wang Zheng-Xiong1
1.Key Laboratory of Materials Modification by Laser, Ion, and Electron Beams(Ministry of Education), School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China;
2.China Aerospace Academy of Systems Science and Engineering, Beijing 100048, China
Fund Project:Project supported by the National Natural Science Foundation of China (Grant Nos. 11322549, 11275043, 11305027), Funds of Dalian Young Talents (Grant No. 2015R001), and the Fundamental Research Funds for the Central Universities, China (Grant Nos. DUT14RC(3)157, DUT15YQ103).Received Date:19 June 2016
Accepted Date:18 August 2016
Published Online:05 November 2016
Abstract:The influences of safety factor q profile and poloidal rotation profile on the q=1 tearing and Kelvin-Helmholtz (K-H) instabilities are investigated numerically by using a magnetohydrodynamic model in cylindrical geometry. With increasing the poloidal rotation, the m/n=1/1 mode is suppressed, while four domains exist for the high-order harmonic modes (such as m/n=2/2, m/n=3/3):the destabilized tearing mode domain, stabilized tearing mode domain, stable-window domain, and unstable K-H mode domain. Further, we find that the growth rate of the m/n=1/1 mode is related to the location of shear layer. Roles of shear flow in the m/n=1/1 mode for the shear layer located t on both the inner and outer sides of rational surface are almost the same, which is different from the scenarios of high-order harmonic modes. In addition, the smaller the magnetic shear on the rational surface, the smaller the growth rate of tearing mode is, and the more easily the K-H instability is excited.
Keywords: q profile/
rotation profile/
tearing mode instability/
Kelvin-Helmholtz instability
