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Chin. Phys. B, 2014, Vol. 23(8): 085201    DOI: 10.1088/1674-1056/23/8/085201
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES Prev   Next  

Compound sawtooth in EAST LHCD plasma:An experimental study

Xu Li-Qing (徐立清), Hu Li-Qun (胡立群), Chen Kai-Yun (陈开云), Li Miao-Hui (李妙辉)
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China
Abstract  A compound sawtooth with an incomplete relaxation was observed in EAST's lower hybrid current drive (LHCD) plasma. The sub-crash phase of the compound sawtooth corresponds to a longer-lasting and slower-growing 1/1 mode. Based on the two-dimensional (2D) SXR tomography, the time-dependent 2D image of a compound sawtooth crash is obtained. The island produced during a resistive internal kink mode is observed in the all crash phases of the compound sawtooth. The destabilization of 1/1 long-lasting saturated 1/1 mode is related to the current driven by the LHCD near the q=1 surface.
Keywords:  compound sawtooth      EAST      LHCD plasma  
Received:  17 October 2013      Revised:  06 March 2014      Accepted manuscript online: 
PACS:  52.35.Py (Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.))  
  52.70.La (X-ray and γ-ray measurements)  
  52.55.Tn (Ideal and resistive MHD modes; kinetic modes)  
  52.55.Fa (Tokamaks, spherical tokamaks)  
Fund: Project partially supported by the JSPS-NRF-NSFCA3 Foresight Program in the Field of Plasma Physics (NSFC) (Grant No. 11261140328) and the National Natural Science Foundation of China (Grant No. 10935004).
Corresponding Authors:  Xu Li-Qing     E-mail:  lqxu@ipp.cas.cn

Cite this article: 

Xu Li-Qing (徐立清), Hu Li-Qun (胡立群), Chen Kai-Yun (陈开云), Li Miao-Hui (李妙辉) Compound sawtooth in EAST LHCD plasma:An experimental study 2014 Chin. Phys. B 23 085201

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