Dimensionless parameter dependence of H-mode pedestal width using hydrogen and deuterium plasmas in JT-60U

The characteristics of the spatial width of the H-mode pedestal were investigated in hydrogen and deuterium plasmas in JT-60U. Both the database analysis and the dedicated experiments on the mass scan indicated that the pedestal width depends very weakly on the plasma particle species or . Identical profiles of the edge ion temperature T i were obtained in the experiments with hydrogen and deuterium plasmas while the profile for the H-mode edge pedestal is not fixed but differs by a factor of ∼1.4 (which is the square root of the mass ratio). In addition, an experiment on edge β pol scan was also performed. Higher β pol plasma had higher pedestal T i value accompanied by greater pedestal width in spite of almost identical at the pedestal. Based on these dimensionless parameter scans, the scaling of the pedestal width was evaluated as .