chapter  Chapter 22
11 Pages

Bifurcation

WithAkira Yoshizawa, Sanae-I Itoh, Kimitaka Itoh

Surveying the properties of plasma turbulence and turbulent-driven transport, the following points about turbulence in inhomogeneous plasma must be made.

Fluctuations do not follow the equipartition law.

Various turbulent states and plasma profiles exist for common external control parameters.

Among the different states, differences are seen in the average spectrum and in its dependencies on the global driving parameters (such as gradient), and in the dynamical and spatial structure of the global profile, e.g., the presence of a mesoscale structure (electric field domain interface, zonal flow, streamer, etc.).

The change between different states happens in a short time of nonlinear decorrelation rate, often being triggered by subcritical excitation.