Zonal flow energy ratio evolution during L-H and H-L transitions in EAST plasmas

The essential role of zonal flow in the L-H transition and the suppression of turbulence have been studied with a long range correlation technique using Langmuir probe arrays in EAST tokamak.Two toroidally localized probe arrays are used to measure the zonal flow during L-H transition and H-L back t...

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Published inPlasma science & technology Vol. 19; no. 3; pp. 54 - 61
Main Author 赵海林 兰涛 刘阿娣 孔德峰 沈华刚 吴捷 刘万东 俞昌旋 张炜 徐国盛 万宝年
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.03.2017
Subjects
EAST装置
energy ratio
L-H transition
L-H转换
zonal flow
等离子体
纬向气流
能量比
转换期
进化
长程相关性
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ISSN1009-0630
1009-0630
DOI10.1088/2058-6272/19/3/035101

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Summary:The essential role of zonal flow in the L-H transition and the suppression of turbulence have been studied with a long range correlation technique using Langmuir probe arrays in EAST tokamak.Two toroidally localized probe arrays are used to measure the zonal flow during L-H transition and H-L back transition.The energy ratio of the low frequency zonal flow to the total drift wave turbulence is calculated.During ELM-free H mode,the energy ratio is higher than that in L mode,which reveals the important role of zonal flows in regulating turbulence amplitude in L-H transition.
Bibliography:zonal flow, L-H transition, energy ratio
Hailin ZHAO 1,2, Tao LAN 1, Adi LIU 1,Defeng KONG 1,2, Huagang SHEN 1, Jie WU 1,Wandong LIU1, Changxuan YU 1, Wei ZHANG 2,Guosheng XU2 ,Baonian WAN 2（1 Department of Modem Physics, University of Science and Technology of China, Hefei 230026, People＇s Republic of China 2 Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People＇s Republic of China）
The essential role of zonal flow in the L-H transition and the suppression of turbulence have been studied with a long range correlation technique using Langmuir probe arrays in EAST tokamak.Two toroidally localized probe arrays are used to measure the zonal flow during L-H transition and H-L back transition.The energy ratio of the low frequency zonal flow to the total drift wave turbulence is calculated.During ELM-free H mode,the energy ratio is higher than that in L mode,which reveals the important role of zonal flows in regulating turbulence amplitude in L-H transition.
34-1187/TL
PST-2016-0242.R4
Institute of Plasma Physics
ISSN:1009-0630
1009-0630
DOI:10.1088/2058-6272/19/3/035101