| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Repetitive 'Snakes' and Their Damping Effect on Core Toroidal Rotation in EAST Plasmas with Multiple H–L–H Transitions |
| 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
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| Cite this article: |
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XU Li-Qing, HU Li-Qun, CHEN Kai-Yun et al 2014 Chin. Phys. Lett. 31 105201 |
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Abstract 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,c Z2/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.
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Published: 31 October 2014
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| PACS: |
52.35.Py
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(Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.))
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52.70.La
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(X-ray and γ-ray measurements)
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52.55.Tn
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(Ideal and resistive MHD modes; kinetic modes)
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52.55.Fa
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(Tokamaks, spherical tokamaks)
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Abstract
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