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

G.S. Xu, H. Q. Wang, B. N. Wan, H. Y. Guo, Volker Naulin, P. H. Diamond, G. R. Tynan, M. Xu, Ning Yan, W. Zhang, J. F. Chang, L. Wang, R. Chen, S. C. Liu, S. Y. Ding, L. M. Shao, H. Xiong, H. L. Zhao

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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 (H-98y,H-2 similar to 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. [http://dx.doi.org/10.1063/1.4769852]
Original languageEnglish
JournalPhysics of Plasmas
Volume19
Issue number12
Pages (from-to)122502
Number of pages5
ISSN1070-664X
DOIs
Publication statusPublished - 2012

Keywords

  • PHYSICS,
  • TURBULENCE
  • PLASMA

Cite this

Xu, G. S., Wang, H. Q., Wan, B. N., Guo, H. Y., Naulin, V., Diamond, P. H., Tynan, G. R., Xu, M., Yan, N., Zhang, W., Chang, J. F., Wang, L., Chen, R., Liu, S. C., Ding, S. Y., Shao, L. M., Xiong, H., & Zhao, H. L. (2012). First observation of a new zonal-flow cycle state in the H-mode transport barrier of the experimental advanced superconducting Tokamak. Physics of Plasmas, 19(12), 122502. https://doi.org/10.1063/1.4769852