Abstract
Transport barriers have been observed in tokamak experiments involving negative magnetic shear. The use of non-twist maps has been proposed in order to explain the underlying dynamical mechanism of such barriers. In this work we derive an area-preserving analytical map to describe the formation of a transport barrier in a chaotic field line region of a tokamak with an ergodic magnetic limiter. The map so obtained is used to investigate the radial diffusion of field lines in such a configuration.
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