Observations of zonal flows in electrode biasing experiments on the Joint Texas Experimental tokamak
Shen H.G.
Lan T.
Chen Zhipeng
Kong D.F.
Zhao H.L.
Wu J.
Sun X.
Liu A.
Xie Jinlin
Li H.
Ding W.X.
Liu Wan-Dong
Yu C.X.
Sun Youwen
Liu H.Q.
Wang Z.J.
Zhuang G.
· 2016
期刊名称：
Physics of Plasmas
2016 年
23 卷
4 期
摘要：
Zonal flows (ZFs) are observed during the electrode biasing (EB) high confinement mode (H-mode) using Langmuir probe arrays on the edge of J-TEXT tokamak. The long-distance correlation characteristics of floating potentials and interactions with turbulence are studied. During positive biasing H-mode, either the geodesic acoustic mode or low frequency ZF increases. Strong suppression of radial transport by ZFs is found in the low frequency region. The components of the radial particle flux without and with EB are compared in the frequency domain. The interaction between ZFs and ambient turbulence is also discussed. The results show that the rate of ZFs' shear is comparable with that of E ?— B shear, suggesting that ZFs could be the trigger of the biasing H-mode.
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