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The intrinsic
three-dimensional nature of the stellarator
fields implies that small magnetic surfaces
breaking and/or magnetic islands may be present at
the rational surfaces. This may lead to pressure
profiles with a great deal of structure, similar to
the devil's staircase. Furthermore, the presence of
the vacuum magnetic field islands coupled to plasma
turbulence enhances local poloidal flows that
contribute to the overall self-organization
process.
We investigate the
consequences for plasma stability and transport of
such structures.
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Pressure profile
with local flattening obtained from optimization
of linear stability and from the nonlinear
evolution of resistive pressure-gradient-driven
turbulence..
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