INFLUENCE OF RESONANT MAGNETIC PERTURBATIONS ON PLASMA EDGE TURBULENCE

This work reports alterations on plasma-edge equilibrium profiles and on edge turbulence, and anomalous transport induced by resonant pertur bing magnetic fields in the TBR (Brazilian Tokamak) tokamak [J. Fusion Energy 12, 295 (1993)]. Thus, these perturbations have reduced the eq uilibrium parameters and the spectral power of the fluctuations and en hanced their phase velocity. They have also reduced the particle flux at the plasma edge. All these electrostatic edge parameters have been computed by taking into account temperature fluctuation corrections. A lthough the perturbation slightly affected just the linear correlation between electrostatic fluctuations, its bispectral analysis shows a r eduction of the quadratic mode coupling. Furthermore, the energy trans ferred between different spectral components, with and without the mag netic perturbation, did not have the same direction for all fluctuatio ns. Finally, the normal probability distribution functions of the fluc tuations show significant non-Gaussian features, although the fluctuat ing potential distribution became near Gaussian with the magnetic pert urbation. (C) 1997 American Institute of Physics.