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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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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Abstract 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.
AbstractList 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 (∼5 kHz). 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.
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.
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
AuthorAffiliation Key Laboratory of Materials Modification 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;Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People＇s Republic of China
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10.1063/1.3499237
10.1063/1.1449463
10.1103/PhysRevLett.71.3127
10.1016/S0022-3115(00)00623-1
10.1103/PhysRevLett.92.245002
10.1016/S0022-3115(97)80039-6
10.1016/S0022-3115(02)01398-3
10.1016/S0022-3115(98)00522-4
10.1103/PhysRevLett.83.2203
10.1103/PhysRevLett.84.4842
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Notes 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
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Snippet 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...
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...
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SubjectTerms 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
Title The observation of small ELM post-cursor mode in EAST
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