Possibility of electric field bifurcation and internal transport barrier formation in LHD plasma

Theoretical analysis of the electric field bifurcation is made for the LHD plasma. For given shapes of plasma profiles; a region of bifurcation is obt ained in a space of the plasma parameters. In this region of plasma paramet ers, the electric field domain interface is predicted to appear in the plas ma column. The reduction of turbulent transport is expected to occur in the vicinity of the interface; inducing internal transport barrier. Within the present simple model, the electric field bifurcation associated with the i nternal transport barrier is predicted to be realized for the parameter of T-e(0) similar or equal to 2 keV and n(0) similar or equal to 10(18)(m(-3)) . The boundary of the region of multiple solution is characterized by a sca ling T-e(0) similar to [n(0)](0.4).