Characterization of Type-I ELMs in tangential co-, balanced- and counter-plus perpendicular NBI heated plasmas on JT-60U

Effects of plasma rotation and losses of fast ions on Type-I ELM characteristics have been systematically studied in the JT-60U tokamak, scanning combinations of NBI (tangential co-, balanced- and counter-NBI plus perpendicular NBI) in the three types of plasma configurations (corresponding toroidal field ripple at the plasma edge, delta(r)similar to 0.4, 1.0 and 2.0%). New findings on the Type-I ELM characteristics are as follows: smaller ELM energy loss normalized by pedestal stored energy, Delta W-ELM/W-ped, and faster ELM frequency, f(ELM), are confirmed in the counter-NBI in comparison with the co-NBI discharges. Nevertheless, the power loss due to ELM, P-ELM (= Delta W-ELM X f(ELM)), nonnalized by heating power crossing the separatrix, P-SEP, is constant regardless of the direction of the momentum injection at each plasma configuration. In contrast, the P-ELM/P-SEP decreases with increasing delta(r). The relationship between ELMs, rotation and the losses of fast ions are discussed.