Analysis of wave instabilities evolution in plasma and turbulent processes in fluid

It is important to know basis of plasma turbulence induced by different wave instabilities in order to reduce the turbulent transport. There are many developed theories in which processes of plasma turbulence suppression by sheared flows are widely presented. In agreement with experiments theoretical researches¹, ² say that shearing effects lead to tilting or breaking of eddy structures. These effects were also compared with certain turbulent processes in fluid. But these researches mainly considered developed turbulence and slightly showed evolution of the plasma turbulence. It is known that sheared flows can suppress the turbulence induced by ion temperature gradient mode and partially by trapped electron mode, but no by electron temperature gradient mode. On the other side there was discovered evolution of wave instabilities in fluid that have been known for a long time3. Also there is no doubt that wave instabilities precisely are the cause of onset of the plasma turbulence. In this study were taken into account results of drift wave theory and other existing experimental works such as, for example, plasma turbulence imaging via beam emission spectroscopy4. Possible correlation lengths were found at the initial time of developed turbulence formation in plasma. Estimates are linked with parameters of wave instabilities.