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Physics of plasma turbulence and transition, pioneered by minimal models

Miki, Kazuhiro

This is the award lecture of the 8th Young Scientist Award of the Physical Society of Japan. I have investigated various plasma critical phenomena dominated by nonlinear dynamics. First, I constructed a predator-prey model interacting with turbulence and zonal flow and GAM. The model was motivated by fluid simulations in the critical region of the ITG. Next, I have derived a one-dimensional reduced model for the L-H transition, based on the two predator-one prey model. Numerical studies revealed the possible trigger for the L-H transition, i.e. the bursty behavior of the zonal flows. Finally, the one-dimensional model was applied to the stimulated L-H transition induced by particle injection. The trigger for the transition is a change of edge radial electric field. Here, the zonal flow does not play a critical role to trigger the transition.

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