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Three-dimensional computations of turbulence arising from the nonlinear collisional drift wave equations are carried out. The flux-surface-based coordinate system is aligned with the magnetic field, and the geometry is that of an actual model tokamak with arbitrary poloidal cross section. The physical periodicity constraint is rigorously respected. The results show that the dominant process arising from this system is the 3-dimensional version of the collisional drift wave nonlinear instability, in which fluctuation free energy transfer among parallel wavelengths plays an enhanced role. Poloidal asymmetry in the fluctuations and associated transport are found to result primarily from the poloidal variation in the ion polarization drift and not the more traditional ballooning (magnetic curvature) effects.

Additional information

Authors: SCOTT B, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Article: Plasma Physics and Controlled Fusion, Vol. 39 (1997) pp. 471-504
Record Number: 199710555 / Last updated on: 1997-05-09
Original language: en
Available languages: en