NONDIMENSIONAL TRANSPORT STUDY OF JT-60U PLASMAS

Nondimensional local transport analysis of JT-60U plasmas has been carried out for NBI heated L-mode phase. Plasmas with the same poloidal cross section and almost the same profiles of nondimensional parameters such as nu*, beta(th), q, T-e/T-i except for rho* are compared. The rho* dependence of the one fluid thermal diffusivity, chi(eff), the electron thermal diffusivity, chi(e), and the ion thermal diffusivity, chi(i), has been examined. The property of chi(eff) is between the weak gyroBohm type diffusion and the Bohm type diffusion in the region a/3 less than or equal to r less than or equal to 2a/3, which is consistent with the results of the global confinement study done before. We have also found that chi(e) is weak gyroBohm type diffusion while chi(i) tends to be Bohm like diffusion.