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The coupling
between turbulence and shear flows amplified
through Reynolds stress leads to self-organization
in plasmas with multiple states and spontaneous
transitions between them.
Depending on the
dimensionality of the problem, the
self-organization is limited to profile
reorganization or involves turbulence suppression.
In the later case, this suppression causes local
improvement of confinement and may trigger
transition to high confinement states.
The physics
understanding of this self-organization process and
the consequences for plasma confinement are the
goal of these studies.
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Radial profile
of the averaged poloidal flow generated through
Reynolds stress by pressure-gradient-driven
fluctuations and the corresponding r.m.s.
pressure fluctuation level. Regions of high
shear flow correspond to low fluctuation levels,
and the fluctuation peaks live within the
maximum of the shear.
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