PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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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 |
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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.
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Received: 17 October 2013
Revised: 06 March 2014
Accepted manuscript online:
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PACS:
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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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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
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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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