Characteristics of edge pedestal width in JT-60U ELM-free H-mode plasmas

The edge pedestal widths in ion and electron temperature profiles for H-mode discharges have been measured during an ELM-free phase over a wide range of plasma current of 1-4.5 MA in JT-60U. The pedestal width of the ion temperature indicates a dependence on both inverse poloidal field and edge ion temperature. As a result, it is shown that the pedestal width linearly scales like , where is the inverse aspect ratio and is the poloidal gyroradius for thermal ions. The pedestal width is also compared with theoretical predictions.