On the turbulence interface in magnetically confined plasmas

In this contribution, two examples of the turbulence interface formation are shown. The first example is the turbulence interface at the edge transport barrier (ETB) in tokamak plasmas. Because of the radial electric field structure formation, the turbulence spatial structure is strongly modified. A model describing how the turbulence profile modification occurs is examined. The second example is the turbulence interface formed by a coexisting pair of instabilities observed in a linear magnetized plasma. Probe measurement reveals that the linearly driven drift wave excites a steep gradient of the parallel ion flow, which secondarily raises the parallel flow shear driven mode. the so-called D'Angelo mode. Although the habitats of these two modes are separated in radius, they oscillate simultaneously correlating with each other. Due to such dynamics, an interface of different modes self consistently appears.