摘要
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.
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.
作者
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
Hailin ZHAO Tao LAN Adi LIU Defeng KONG Huagang SHEN Jie WU Wandong LIU Changxuan YU Wei ZHANG Guosheng XU Baonian WAN(Department of Modem 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)
基金
the EAST team for their support during the experiments
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
the Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology with Grant No.2014FXCX003
