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Topology and transport: Difference between revisions
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Recent experimental results in the TJ-II stellarator prove the existence of long-distance correlations | Recent experimental results in the TJ-II stellarator prove the existence of long-distance correlations | ||
in the electrostatic potential around the bifurcation point for the emergence of the plasma edge sheared | in the electrostatic potential around the bifurcation point for the emergence of the plasma edge sheared | ||
flow layer <ref>[http://prl.aps.org/abstract/PRL/v100/i21/e215003 M. A. Pedrosa et al., Phys. Rev. Lett. 100, 215003 (2008)]</ref>. | flow layer <ref>[http://prl.aps.org/abstract/PRL/v100/i21/e215003 M. A. Pedrosa et al., Phys. Rev. Lett. 100, 215003 (2008)]</ref>. Trying | ||
to understand these results from a theoretical point of view, we have formulated a phenomenological model | |||
<ref>[http://www.iop.org/EJ/abstract/-search=68892777.7/0741-3335/51/6/065007 I. Calvo et al., Plasma Phys. Control. Fusion 51 065007 (2009)]</ref> | <ref>[http://www.iop.org/EJ/abstract/-search=68892777.7/0741-3335/51/6/065007 I. Calvo et al., Plasma Phys. Control. Fusion 51 065007 (2009)]</ref> | ||
which based on the | |||
paradigm of flow shear generation by Reynolds stress and turbulence supression by | |||
shear. We suggest that the experimental results might be an indirect evidence of the development of poloidally asymmetric zonal flows. | shear. We suggest that the experimental results might be an indirect evidence of the development of poloidally asymmetric zonal flows. | ||