Js. Kim et al., MEASUREMENTS OF NONLINEAR ENERGY-TRANSFER IN TURBULENCE IN THE TOKAMAK FUSION TEST REACTOR, Physical review letters, 79(5), 1997, pp. 841-844
The application of anew bispectral analysis technique to density fluct
uation measurements in the core of the Tokamak Fusion Test Reactor ind
icates that the peak in the autopower spectrum usually lies in a regio
n of linear stability. Large changes in the linear and nonlinear chara
cteristics of the turbulence are observed as the plasma toroidal rotat
ion and/or confinement properties are varied, while estimates of the t
urbulence-driven diffusivity varies only slightly with rotation. These
observations are consistent with the operation of a global organizing
property that may be related to the observation of Bohm-like scaling
of ion thermal transport.