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H-mode: Difference between revisions
→Physical mechanism
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This transport bifurcation is the consequence of the suppression of turbulence in the edge plasma, induced by a sheared flow layer and an associated edge radial electric field. | This transport bifurcation is the consequence of the suppression of turbulence in the edge plasma, induced by a sheared flow layer and an associated edge radial electric field. | ||
The local suppression of turbulence leads to a reduction of transport and a steepening of the edge profiles. | The local suppression of turbulence leads to a reduction of transport and a steepening of the edge profiles. | ||
<ref>[http://dx.doi.org/10.1088/0741-3335/49/12B/S01 F. Wagner, ''A quarter-century of H-mode studies'', Plasma Phys. Control. Fusion '''49''' (2007) B1-B33]</ref> | |||
The sheared flow is generated by the turbulence itself via the Reynolds Stress mechanism. | The sheared flow is generated by the turbulence itself via the Reynolds Stress mechanism. | ||
<ref>[http://dx.doi.org/10.1088/0741-3335/ | <ref>[http://dx.doi.org/10.1088/0741-3335/43/10/308 S.B. Korsholm et al, ''Reynolds stress and shear flow generation'', Plasma Phys. Control. Fusion '''43''' (2001) 1377-1395]</ref> | ||
Thus, the H-mode is the consequence of a self-organizing process in the plasma. | Thus, the H-mode is the consequence of a self-organizing process in the plasma. | ||
The details of this mechanism are the subject of ongoing studies. | The details of this mechanism are the subject of ongoing studies. | ||