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Cheng, J; Dong, J Q; Itoh, K; Yan, L W; Xu, M; Zhao, K J; Hong, W Y; Huang, Z H; Ji, X Q; Zhong, W L; Yu, D L; Itoh, S-I; Nie, L; Kong, D F; Lan, T; Liu, A D; Zou, X L; Yang, Q W; Ding, X T; Duan, X R; Liu, Yong
Physical review letters, 06/2013, Volume: 110, Issue: 26Journal Article
The dynamic features of the low-intermediate-high-(L-I-H) confinement transitions on HL-2A tokamak are presented. Here we report the discovery of two types of limit cycles (dubbed type-Y and type-J), which show opposite temporal ordering between the radial electric field and turbulence intensity. In type-Y, which appears first after an L-I transition, the turbulence grows first, followed by the localized electric field. In contrast, the electric field leads type-J. The turbulence-induced zonal flow and pressure-gradient-induced drift play essential roles in the two types of limit cycles, respectively. The condition of transition between types-Y and -J is studied in terms of the normalized radial electric field. An I-H transition is demonstrated to occur only from type-J.
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