The observation of small ELM post-cursor mode in EAST

Nan ZHAO (赵楠); Ning YAN (颜宁); Guosheng XU (徐国盛); Zhengxiong WANG (王正汹); Ran CHEN (陈冉); Huiqian WANG (汪惠乾); Liang WANG (王亮); Siye DING (丁斯晔); Linming SHAO (邵林明); Liang CHEN (陈良); Guanghai HU (胡广海); Wei ZHANG (张炜)

doi:10.1088/2058-6272/aa9bd8

Plasma Science and Technology > 2018 > 20(2): 24007-024007. > DOI: 10.1088/2058-6272/aa9bd8

Nan ZHAO (赵楠), Ning YAN (颜宁), Guosheng XU (徐国盛), Zhengxiong WANG (王正汹), Ran CHEN (陈冉), Huiqian WANG (汪惠乾), Liang WANG (王亮), Siye DING (丁斯晔), Linming SHAO (邵林明), Liang CHEN (陈良), Guanghai HU (胡广海), Wei ZHANG (张炜). The observation of small ELM post-cursor mode in EAST[J]. Plasma Science and Technology, 2018, 20(2): 24007-024007. DOI: 10.1088/2058-6272/aa9bd8

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The observation of small ELM post-cursor mode in EAST

1 Key Laboratory of Materials Modi?cation by Laser, Ion and Electron Beams (Ministry of Education), School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, People’s Republic of China 2 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China

Funds: This work is supported by the National Magnetic Confinement Fusion Science Program of China under Grant Nos. 2015GB101000, 2014GB124000, National Natural Science Foundation of China under Grant Nos. 11322549, 11422546, 11505222, 11505220 and the Sino Danish Center for Education and Research.

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Received Date: July 18, 2017

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Abstract

Abstract

A ‘post-cursor’ quasi-coherent mode with frequency ～50 kHz has been observed following the crash of small edge localized modes (ELMs) in the Experimental Advanced Superconducting Tokamak by using a reciprocating Langmuir probe system inserted at the outboard midplane. This mode with strong potential and magnetic perturbations propagates in the electron-diamagnetic drift direction in the laboratory frame. In addition, these quasi-coherent fluctuations appear to be modulated by a MHD mode with lower frequency (～5kHz).The bi-coherence analysis shows that the post-cursor mode and the MHD mode have nonlinear interaction through three-wave coupling. The understanding on post-cursor mode can enhance our knowledge of ELMs and pedestal physics, and give new insight into the ELM process itself.
- post-cursor mode,
- H-mode,
- small ELM

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References (25)

References

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