Turbulence studies in tokamak boundary plasmas with realistic divertor geometry

Results are presented from the 3-D non-local 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 identific...

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Bibliographic Details
Published in:Nuclear fusion 2000-03, Vol.40 (3Y), p.731-736
Main Authors: Xu, X.Q, Cohen, R.H, Porter, G.D, Rognlien, T.D, Ryutov, D.D, Myra, J.R, D'Ippolito, D.A, Moyer, R.A, Groebner, R.J
Format: Article
Language:English
Subjects:
Computational geometry
Computer simulation
Diamagnetism
Electromagnetic field theory
Magnetoplasma
Plasma confinement
Plasma density
Thermodynamics
Tokamak devices
Transport properties
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Summary:Results are presented from the 3-D non-local 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; (2) turbulence suppression in the L-H transition by shear in the ExB drift velocity, ion diamagnetism and finite polarization; (3) the fact that calculated values of the thermal diffusivities such as Chi sub(i) are comparable to those inferred from the experimentally measured plasma density and temperature profiles. On the basis of simulation results, a parameterization of the transport is given that includes the dependence on the relevant physical parameters.
ISSN:0029-5515
1741-4326
DOI:10.1088/0029-5515/40/3Y/339