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

A theory of the effect of the geodesic acoustic mode (GAM) on turbulence is presented. Two
synergistic issues are elucidated: namely, the physics of the zonal flow modulation and its …

Ideal magnetohydrodynamic (MHD) theory is used to investigate some of the fundamental
properties of the geodesic acoustic continuum modes (GAMs) in tokamaks, including their …

A simple one-field LH transition model is studied in detail, analytically and numerically. The
dynamical system consists of three equations coupling the drift wave turbulence level, zonal …

Collisionless trapped ion modes (CTIMs) turbulence exhibits a rich variety of zonal flow
physics. The coupling of CTIMs with shear flow driven by the Kelvin-Helmholtz (KH) …

We address the mechanisms underlying low-frequency zonal flow generation in turbulent
system and the associated intermittent regime of ion-temperature-gradient (ITG) turbulence …

Starting from the Braginskii equations, relevant for the tokamak edge region, a complete set
of nonlinear equations for the geodesic acoustic modes (GAM) has been derived which …

Zonal flows (ZFs) are excited transiently by geodesic acoustic modes (GAMs) in toroidal
plasmas. When GAMs have radially inward and outward propagating components, these …

There are two distinct phases in the evolution of drift wave envelope in the presence of zonal
flow. A long-lived standing wave phase, which we call the Caviton, and a short-lived …

Through a systematically developed theory, we demonstrate that the motion of Instanton
identified in Zhang et al (2017 Phys. Plasmas 24 122304) is highly correlated to the …