Analytical and numerical studies of ion mobility near the tokamak plasma edge

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Abstract
The effects of radial electric field on charged particle motion and transport in the toroidal magnetic system have been studied both analytically and numerically. The effects of radial electric field on particle orbits are examined, allowing for the relatively large and strongly sheared field observed in some experiments. It is found that ion radial mobility due to the combined effects of radial electric field and charge exchange collisions can dramatically affect the ion transport and orbit loss near the tokamak edge. These properties may help understand the formation of transport barrier near the tokamak plasma edge during high confinement mode (H-mode) discharge and explain the asymmetry between bias voltage and confinement in biased-electrode-induced H-mode.