FLOW SHEAR STABILIZATION OF A HYBRID DISSIPATIVE TRAPPED ELECTRON-IONTEMPERATURE-GRADIENT MODE IN TOKAMAKS

A simple physical model for toroidal flow shear stabilization of a hyb rid dissipative trapped electron-ion temperature gradient mode (namely , the hybrid electron-ion drift mode) is presented. Coupling between t he sheared flows and non-adiabatic electrons is proposed as the stabil ization mechanism of the hybrid electron-ion drift mode. This implies that the confinement improvement can be achieved not only through the poloidal sheared rotation flow in the edge region of tokamaks for the L-H transition but also through the toroidal sheared rotation in the c ore region for further confinement improvement associated with the int ernal transport barrier and negative shear.