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Abstract

Three-dimensional (3-D) simulations of drift-resistive ballooning turbulence are presented. The turbulence is basically controlled by a parameter alpha, the ratio of the drift wave frequency to the ideal ballooning growth rate. If this parameter is small (alpha<1, corresponding to Ohmic (OH) or low confinement phase (L-mode) plasmas), the system is dominated by ballooning turbulence, which is strongly peaked at the outside of the torus. If it is large (alpha>1, corresponding to high confinement phase (H-mode) plasmas), field line curvature plays a minor role. The turbulence is nonlinearly sustained even if curvature is removed and all modes are linearly stable due to magnetic shear. In the nonlinear regime without curvature the system obeys a different scaling law compared to the low-alpha regime. The transport scaling is discussed in both regimes and the implications for OH, L-mode, and H-mode transport are discussed.

Additional information

Authors: ZEILER A, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);BISKAMP D, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);DRAKE J F, University of Maryland, Institute for Plasma Research (US);GUZDAR P N, University of Maryland, Institute for Plasma Research (US)
Bibliographic Reference: Article: Phys. Plasmas, Vol. 3 (1996) No. 8, pp. 2951-2960
Record Number: 199611346 / Last updated on: 1996-11-21
Category: PUBLICATION
Original language: en
Available languages: en