Characterization of H-mode pedestal width based on hydrogen and deuterium discharges in JT-60U

Urano, Hajime; Takizuka, Tomonori; Kamada, Yutaka; Oyama, Naoyuki; Takenaga, Hidenobu; JT-60 Team

Conducting the experiments on the H-modes in hydrogen (H) and deuterium (D) discharges, the edge non-dimensional parameter dependence of the H-mode pedestal width has been examined. However, the scalings of the pedestal width vary from machine to machine. This disagreement can be caused by the existing strong co-linearity between and , which is hard to separate out in the peripheral region. In this study, to distinguish these variables, focusing on the mass dependence of (), a pair of experiments in H and D plasmas were conducted. If the pedestal width were determined by , it would be impossible to match the pedestal width while keeping the edge pressure gradient fixed between H and D plasmas. However, in the experiment, we obtained the same edge profiles for H and D discharges while the required power in the H plasma was times larger than that in D plasma. This result indicates that the H-mode pedestal width does not remarkably depend on the plasma particle species or .