Increased Nonlinear Coupling between Turbulence and Low-Frequency Fluctuations at the L-H Transition
作者： R. A. Moyer , G. R. Tynan , C. Holland , M. J. Burin
DOI: 10.1103/PHYSREVLETT.87.135001
关键词: Physics 、 Scale (ratio) 、 Turbulence 、 Nonlinear coupling 、 Shear flow 、 Flow (psychology) 、 Low frequency 、 Condensed matter physics 、 Tokamak 、 Coupling (probability)
摘要: The nonlinear coupling between small scale high-frequency turbulence and larger lower-frequency fluctuations increases transiently in transitions to improved confinement the DIII-D tokamak. This increase starts before rapid suppression $E\ifmmode\times\else\texttimes\fi{}B$ shear-flow development region that becomes $H$-mode transport barrier/shear flow region. After transition, returns $L$-mode levels. These results are consistent with expectations for spontaneous triggered by a turbulence-driven sheared flow.
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