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

  • Author(s): Xu, GS
  • Wang, HQ
  • Wan, BN
  • Guo, HY
  • Naulin, V
  • Diamond, PH
  • Tynan, GR
  • Xu, M
  • Yan, N
  • Zhang, W
  • Chang, JF
  • Wang, L
  • Chen, R
  • Liu, SC
  • Ding, SY
  • Shao, LM
  • Xiong, H
  • Zhao, HL
  • et al.

Published Web Location

https://doi.org/10.1063/1.4769852Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Public License
Abstract

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 (0.05-1MHz) turbulence was observed in the steep-gradient region leading to intermittent transport events across the edge transport barrier. Good confinement (H98y,2∼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. © 2012 American Institute of Physics.

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