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The theory of early nonlinear stage of m=1 instability with locally flattened q-profile

The theory of early nonlinear stage of m=1 instability with locally flattened q-profile

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Abstract

In this paper, we analyze the modification of fast particles on the nonlinear radial displacement of m = 1 internal kink mode with a shoulderlike equilibrium current theoretically. Using the matching method on the solutions of the outer and inner regions, we derive the analytical form of nonlinear radial displacement in the limit of q' = q" = 0, which is valid to the cases of weak shear due to a slight flattening of the q(r) profile around q = 1. We have taken into consideration the effects of the circulating and trapped fast particles on the nonlinear state of the mode. It is found that a fast particle can modify the nonlinear saturation level by the change of potential energy, depending on the fast particle properties. By the matching of linear dispersion relation to early nonlinear result, we also obtain the relations of radial displacement to the mode frequency and linear growth rate, and discuss the scaling for different stabilities of the MHD modes.

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基金项目:This work was supported by National Natural Science Foundation of China under Grant Nos. 11605146, 11747311 and the Fundamental Research Funds for the Central Universities under Grant No. 2682016CX061.

收稿日期:2017-12-08

修改稿日期:2018-03-29

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Kai-Qi Cao:Institute of Fusion Science, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu, Sichuan 610031, China
Xian-Qu Wang:Institute of Fusion Science, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu, Sichuan 610031, China

联系人作者:X.-Q. Wang(xianquwang@swjtu.edu.cn)

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引用该论文

Kai-Qi Cao,Xian-Qu Wang. The theory of early nonlinear stage of m=1 instability with locally flattened q-profile[J]. Matter and Radiation at Extremes, 2018, 3(5): 243-247

Kai-Qi Cao,Xian-Qu Wang. The theory of early nonlinear stage of m=1 instability with locally flattened q-profile[J]. Matter and Radiation at Extremes, 2018, 3(5): 243-247

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