First observation of a new zonal-flow cycle state in the H-mode transport barrier of the experimental advanced superconducting Tokamak

Journal Article · Sat Dec 15 00:00:00 EST 2012 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4769852· OSTI ID:22072629

Xu, G S; Wang, H Q; Wan, B N; Guo, H Y; Zhang, W; Chang, J F; Wang, L; Chen, R; Liu, S C; Ding, S Y; Shao, L M; Xiong, H ^[1]; Naulin, V ^[2]; Diamond, P H; Tynan, G R; Xu, M ^[3]; Yan, N ^[1]; Zhao, H L ^[4]

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1. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031 (China)
2. Association Euratom-Riso DTU, DK-4000 Roskilde (Denmark)
3. University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093 (United States)
4. Department of Modern Physics, University of Science and Technology of China, Hefei 230026 (China)

A new turbulence-flow cycle state has been discovered after the formation of a transport barrier in the H-mode plasma edge during a quiescent phase on the EAST superconducting tokamak. Zonal-flow modulation of high-frequency-broadband (0.05-1 MHz) turbulence was observed in the steep-gradient region leading to intermittent transport events across the edge transport barrier. Good confinement (H{sub 98y,2} {approx} 1) has been achieved in this state, even with input heating power near the L-H transition threshold. A novel model based on predator-prey interaction between turbulence and zonal flows reproduced this state well.

• OSTI ID: 22072629
• Journal Information: Physics of Plasmas, Vol. 19, Issue 12; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
EDGE LOCALIZED MODES
H-MODE PLASMA CONFINEMENT
HT-7U TOKAMAK
MHZ RANGE
MODULATION
PREDATOR-PREY INTERACTIONS
TURBULENCE