Geodesic acoustic modes (GAMs) are ubiquitous oscillatory flow phenomena observed in
toroidal magnetic confinement fusion plasmas, such as tokamaks and stellarators. They are …

The present status of zonal flow experiments is reviewed with the historical process to attain
the concept of zonal flows, which provides a new framework for understanding turbulence …

Zonal flows, which means azimuthally symmetric band-like shear flows, are ubiquitous
phenomena in nature and the laboratory. It is now widely recognized that zonal flows are a …

Geodesic acoustic modes (GAM) are shown to constitute a continuous spectrum due to
radial inhomogeneities. The importance and theoretical as well as experimental implications …

In this Letter, we report analyses of spatiotemporal dynamics of turbulence and structure in
the limit-cycle oscillation (LCO) that precedes an L-to-H transition. Zonal flows are not …

The present status of experiments on zonal flows in magnetic confinement experiments is
examined. The innovative use of traditional and modern diagnostics has revealed …

Velocity fields and density fluctuations of edge turbulence are studied in I-mode [F. Ryter et
al., Plasma Phys. Controlled Fusion 40, 725 (1998)] plasmas of the Alcator C-Mod [IH …

This paper describes the first observations in the National Spherical Torus Experiment
(NSTX)[SM Kaye et al, Phys. Plasmas 8, 1977 (2001)] of “quiet periods” in the edge …

Tokamaks have demonstrated excellent plasma confinement capability because of their
symmetry but has an intrinsic drawback because of their pulsed inductive operation. Efforts …

New findings in study of geodesic acoustic modes (GAMs) on the T-10 tokamak since the
last IAEA FEC 2014 are described. The broadband fluctuations of potential φ and electron …