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Long-lived impurity-ion snakes in the EAST ELM-free H-mode Sawtoothing plasma

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Abstract

Two types of long-lived impurity-ion snakes (LLSs) including the ideal-like kink mode which damps before the large sawtooth crash, termed sawtooth-free LLSs (SF-LLSs) and complex LLSs (C-LLSs), which coexist with compound sawtooth and final damping after sawtooth crash were observed in EAST ELM-free H-mode sawtoothing plasma. These LLSs have an m = 1 structure, accompanied by several harmonic modes (m = 2, m = 3...). There is a slight frequency-chirping behavior of the LLS. Similar with the typical sawtooth crash phase, a large crescent-shaped helical island-like structure in the core region of the C-LLSs was visible after the major crash of the coexisting compound sawtooth. The strong coupling of the C-LLSs and the 2/1 tearing mode (TM) can trigger a neo-classical tearing mode (NTM) due to a forced magnetic reconnection.

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Authors and Affiliations

  1. College of Electrical and Information Engineering, Beifang University of Nationlities, Yinchuan, 750021, China

    Tianpeng Ma

  2. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei, 230031, China

    Liqing Xu & Liqun Hu

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  1. Tianpeng Ma
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  2. Liqing Xu
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  3. Liqun Hu
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Correspondence to Liqing Xu.

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Ma, T., Xu, L. & Hu, L. Long-lived impurity-ion snakes in the EAST ELM-free H-mode Sawtoothing plasma. Journal of the Korean Physical Society 66, 1704–1710 (2015). https://doi.org/10.3938/jkps.66.1704

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  • DOI: https://doi.org/10.3938/jkps.66.1704

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