The observation of small ELM post-cursor mode in EAST

A ‘post-cursor＇ quasi-coherent mode with frequency -50 k Hz 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...

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Bibliographic Details
Published inPlasma science & technology Vol. 20; no. 2; pp. 41 - 46
Main Author 赵楠;颜宁;徐国盛;王正汹;陈冉;汪惠乾;王亮;丁斯晔;邵林明;陈良;胡广海;张炜
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.02.2018
Subjects
H-mode
post-cursor mode
small ELM
榆树;Tokamak;光标;东方;频率调制;试验性;局部性;实验室
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ISSN1009-0630
1009-0630
DOI10.1088/2058-6272/aa9bd8

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Summary:A ‘post-cursor＇ quasi-coherent mode with frequency -50 k Hz 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 electrondiamagnetic drift direction in the laboratory frame.In addition,these quasi-coherent fluctuations appear to be modulated by a MHD mode with lower frequency（-5 k Hz）.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.
Bibliography:A ‘post-cursor＇ quasi-coherent mode with frequency -50 k Hz 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 electrondiamagnetic drift direction in the laboratory frame.In addition,these quasi-coherent fluctuations appear to be modulated by a MHD mode with lower frequency（-5 k Hz）.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.
34-1187/TL
post-cursor mode H-mode small ELM
Institute of Plasma Physics
PST-2017-0222.R3
ISSN:1009-0630
1009-0630
DOI:10.1088/2058-6272/aa9bd8