Description: Results are presented from the 3D nonlocal electromagnetic turbulence code BOUT  and the linearized shooting code BAL to study turbulence in tokamak boundary plasmas and its relationship to the L-H transition, in a realistic divertor plasma geometry. The key results include: (1) the identification of the dominant, resistive X-point mode in divertor geometry and (2) turbulence suppression in the L-H transition by shear in the ExB drift speed, ion diamagnetism and finite polarization. Based on the simulation results, a parameterization of the transport is given that includes the dependence on the relevant physical parameters.
Date: October 14, 1998
Creator: Xu, X.Q.
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