Strong braking of m=1 impurity-induced 'snake' in EAST sawtoothing plasma

被引：0
|
作者：
Ma, Tianpeng [1 ]
Xu, Liqing [2 ]
Hu, Liqun [2 ]
机构：
[1] North Univ Ethn, Fdn Dept, Yinchuan 750021, Peoples R China
[2] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China
来源：
PHYSICA SCRIPTA | 2014年 / 89卷 / 09期
基金：
中国国家自然科学基金;
关键词：
snake; m=1 mode locking; MHD kink; tokamak; TOKAMAK;
D O I：
10.1088/0031-8949/89/9/095603
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Strong braking of the m= 1 impurity-induced (e. g. molybdenum emission) density perturbation 'snake' was observed in EAST sawtoothing plasma. The shift of the peak positions of soft x-ray emissions due to the snake can be as high as 7 cm. Notable electron density fluctuations (delta n(e)/ne(0) c an be as high as 8%) originating from this m= 1 snake are measured by a hydrogen cyanide laser interferometer. Due to mode coupling, synchronous locking of the m= 2 tearing mode and m= 1 snakes is expected to happen when the width of the m= 2 island exceeds a critical value. A critical width value of m= 2 for mode locking is calculated. The forced reconnection in the q=2 surface is induced by a toroidal sideband of the m= 1 mode.
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页数：5
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