Repetitive ＇Snakes＇ and Their Damping Effect on Core Toroidal Rotation in EAST Plasmas with Multiple H-L-H Transitions

Repetitive impurity snake modes are observed after H-L mode transitions （high to low confinement modes） in EAST plasmas exhibiting multiple H-L-H transitions. Such snake modes are observed to lower the core plasma toroidal rotation. A critical impurity strength factor associated with snake-mode form...

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Bibliographic Details
Published inChinese physics letters Vol. 31; no. 10; pp. 78 - 81
Main Author 除立清 胡立群 陈开云 李长征 李二众 赵金龙 盛秀丽 张继宗 毛松涛
Format Journal Article
LanguageEnglish
Published 01.10.2014
Subjects
EAST
加热功率
旋转阻尼
模式转换
环向
等离子体
约束模式
蛇
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Summary:Repetitive impurity snake modes are observed after H-L mode transitions （high to low confinement modes） in EAST plasmas exhibiting multiple H-L-H transitions. Such snake modes are observed to lower the core plasma toroidal rotation. A critical impurity strength factor associated with snake-mode formation is estimated to be as high as αz,c = nz,cZ^2/ne - 0.75. These observations have implications for ITER H-mode sustainability when the heating power is only slightly above the H-mode power threshold.
Bibliography:11-1959/O4
Repetitive impurity snake modes are observed after H-L mode transitions （high to low confinement modes） in EAST plasmas exhibiting multiple H-L-H transitions. Such snake modes are observed to lower the core plasma toroidal rotation. A critical impurity strength factor associated with snake-mode formation is estimated to be as high as αz,c = nz,cZ^2/ne - 0.75. These observations have implications for ITER H-mode sustainability when the heating power is only slightly above the H-mode power threshold.
XU Li-Qing, HU Li-Qun, CHEN Kai-Yun, LI Chang-Zheng, LI Er-Zhong, ZHAO Jin-Long, SHENG Xiu-Li, ZHANG Ji-Zong, MAO Song-Tao（ Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031）
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/31/10/105201