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Open Access Publications from the University of California

Zonal flow triggers the L-H transition in the Experimental Advanced Superconducting Tokamak

  • Author(s): Manz, P
  • Xu, GS
  • Wan, BN
  • Wang, HQ
  • Guo, HY
  • Cziegler, I
  • Fedorczak, N
  • Holland, C
  • Müller, SH
  • Thakur, SC
  • Xu, M
  • Miki, K
  • Diamond, PH
  • Tynan, GR
  • et al.

Published Web Location Commons 'BY-NC-ND' version 4.0 license

The kinetic energy transfer between shear flows and the ambient turbulence is investigated in the Experimental Advanced Superconducting Tokamak during the L-H transition. As the rate of energy transfer from the turbulence into the shear flow becomes comparable to the energy input rate into the turbulence, the transition into the H-mode occurs. As the observed behavior exhibits several predicted features of zonal flows, the results show the key role that zonal flows play in mediating the transition into H-mode. © 2012 American Institute of Physics.

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