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

Author

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., and Zhao, H. L.

Subjects
TRANSPORT theory, TOKAMAKS, SUPERCONDUCTIVITY, PLASMA gases, TURBULENCE, HEATING, PHYSICS experiments
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 (0.05-1 MHz) 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. [ABSTRACT FROM AUTHOR]

Published
2012
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