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Rozhansky, V., Kaveeva, E., Voskoboynikov, S., Bonnin, X. and Schneider, R. (2004) Understanding transport barriers through modeling. Nuclear Fusion, 42, 1110. doi:10.1088/0029-5515/42/9/309

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• TITLE: Impact of drifts in edge plasma of small size divertor tokamak

  AUTHORS: Amr H. Bekheit

  KEYWORDS: E × B Drift; Diamagnetic Drifts; B2SOLPS0.5.2D Fluid Transport Code

  JOURNAL NAME: Natural Science, Vol.4 No.2, February 22, 2012

  ABSTRACT: The effect of poloidal E × B and diamagnetic drifts in edge plasma of Small Size Divertor (SSD) Tokamak is studied with two-dimensional B2SO- LPS-0.5.2D fluid transport code. The simulation results show the following: 1) For normal toroidal magnetic field, the increasing of core plasma density leads to large divertor asymmetries due to poloidal E × B and diamagnetic drifts. 2) Switching on the E × B and diamagnetic drifts leads to large change in poloidal distribution of radial electric field and induced counter-clockwise circulation (flow) around the x-point. 3) Switching on the E × B and diamagnetic drifts leads to the structure of poloidal distribution of radial electric field is nonmonotonic which responsible for negative spikes. 4) Switching on the E × B and diamagnetic drifts in vicinity of separatrix leads to the structure of poloidal distribution of radial electric field that has viscous layer. 5) Switching on the E × B and diamagnetic drifts results in torque generation. This torque spins up the toroidal rotation. 6) The E × B drift velocity depends on the plasma temperature heating and doesn't depend on plasma density.