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 ν * , β th , q , T e / T i except for ρ * are compared. The ρ * dependence of the one fluid thermal diffusivity, χ eff , the electron thermal diffusivity, χ e , and the ion thermal diffusivity, χ i , has been examined. The property of χ eff is between the weak gyroBohm type diffusion and the Bohm type diffusion in the region a /3≤ r ≤2 a /3, which is consistent with the results of the global confinement study done before. We have also found that χ e is weak gyroBohm type diffusion while χ i tends to be Bohm like diffusion.