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Zonal flow energy ratio evolution during L-H and H-L transitions in EAST plasmas |
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| Authors: | Hailin ZHAO Tao LAN Adi LIU Defeng KONG Huagang SHEN Jie WU Wandong LIU Changxuan YU Wei ZHANG Guosheng XU Baonian WAN |
| Affiliation: | 1. Department of Modern Physics, University of Science and Technology of China, Hefei 230026, People's Republic of China;Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China;2. Department of Modern Physics, University of Science and Technology of China, Hefei 230026, People's Republic of China;3. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China |
| 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 turbuletce 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. |
| Keywords: | zonal flow L-H transition energy ratio |
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