[摘要]：A set of high frequency coherent (HFC) modes (f = 80-250 kHz) is observed with beam emission spectroscopy measurements of density fluctuations in the pedestal of a strongly shaped quiescent H-mode plasma on DIII-D, with characteristics predicted for kinetic ballooning modes (KBM): propagation in the ion-diamagnetic drift direction; a frequency near 0.2-0.3 times the ion-diamagnetic frequency; inferred toroidal mode numbers of n similar to 10-25; poloidal wave numbers of k(theta) similar to 0.17-0.4 cm(-1); and high measured decorrelation rates (tau(-1)(c) similar to omega(s) similar to 0.5 x 10(6) s(-1)). Their appearance correlates with saturation of the pedestal pressure.
