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Recent progress on studies of spatio-temporal evolution of the L-H transitions

Miki, Kazuhiro

External heating of magnetic confined plasmas can trigger an improvement of edge plasma confinement, i.e. L-H transition. Recent phenomenological progress on the transition has mainly focused on the identification of quasi-periodic oscillation of turbulence fluctuations, i.e. limit-cycle oscillation. We here report the role of zonal flows on triggering L-H transition, using a developed one-dimensional reduced predator-prey model. We also propose transient particle injection can be another trigger of the L-H transition. Besides, we introduce other recent theoretical and numerical studies of the L-H transition.

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