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

Hailin ZHAO (赵海林); Tao LAN (兰涛); Adi LIU (刘阿娣); Defeng KONG (孔德峰); Huagang SHEN (沈华刚); Jie WU (吴捷); Wandong LIU (刘万东); Changxuan YU (俞昌旋); Wei ZHANG (张炜); Guosheng XU (徐国盛); Baonian WAN (万宝年)

doi:10.1088/2058-6272/19/3/035101

Plasma Science and Technology > 2017 > 19(3): 35101-035101. > DOI: 10.1088/2058-6272/19/3/035101

Hailin ZHAO (赵海林), Tao LAN (兰涛), Adi LIU (刘阿娣), Defeng KONG (孔德峰), Huagang SHEN (沈华刚), Jie WU (吴捷), Wandong LIU (刘万东), Changxuan YU (俞昌旋), Wei ZHANG (张炜), Guosheng XU (徐国盛), Baonian WAN (万宝年). Zonal flow energy ratio evolution during L-H and H-L transitions in EAST plasmas[J]. Plasma Science and Technology, 2017, 19(3): 35101-035101. DOI: 10.1088/2058-6272/19/3/035101

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

1 Department of Modern 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

Funds: This work was supported by the National Natural Science Foundation of China with Grant Nos. 10990210, 10990211, 11375188, 11105144, and 11375053, the National Magnetic Confinement Fusion Science Program of China under Contracts Nos. 2013GB106002, 2013GB106003, and the Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology with Grant No. 2014FXCX003).

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Received Date: July 28, 2016

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Abstract

Abstract

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.
- zonal flow,
- L-H transition,
- energy ratio

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References (32)

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