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(THP2/03) Turbulence Studies in Tokamak Boundary Plasmas with Realistic Divertor Geometry

   
X. Q. Xu , R. H. Cohen , G. D. Porter , T. Rognlien , D. D. Ryutov , J. R. Myra 1, D. A. d'Ippolito 1, R. Moyer 2, R. J. Groebner 3
 
Lawrence Livermore National Laboratory, Livermore, California, United States of America
1 Lodestar Research Corporation, Boulder, CO 80301 USA
2 University of California, San Diego, La Jolla, CA 92093 USA
3 General Atomics, San Diego, CA 92186 USA

Abstract
Results are presented from the 3D nonlocal electromagnetic turbulence code BOUT  and the linearized shooting code BAL  for studies of 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 $\rm E \times B$ drift speed, ion diamagnetism and nite polarization. Based on the simulation results, a parameterization of the transport is given that includes the dependence on the relevant physical parameters.

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IAEA 1999