منابع مشابه
Energetic-particle-induced geodesic acoustic mode.
A new energetic particle-induced geodesic acoustic mode (EGAM) is shown to exist. The mode frequency and mode structure are determined nonperturbatively by energetic particle kinetic effects. In particular the EGAM frequency is found to be substantially lower than the standard GAM frequency. The radial mode width is determined by the energetic particle drift orbit width and can be fairly large ...
متن کاملKinetic Theories of Geodesic Acoustic Mode in Toroidal Plasmas
Geodesic Acoustic Modes (GAM) are known to constitute a continuous spectrum due to radial inhomogeneities. The existence of a singular layer causes GAM to mode convert to short wavelength kinetic GAM (KGAM) via finite ion Larmor radius (FLR) and finite guiding-center drift-orbit-width (FOW) effects. The dispersion relation of GAM/KGAM with FLR/FOW as well as parallel electric field contribution...
متن کاملObservation of a new energy channel from energetic particles to bulk ions through geodesic acoustic mode
The energetic-particle driven geodesic acoustic mode (GAM) has been identified on the basis of the spatial structures and frequency measured by heavy ion beam probe (HIBP) and Mirnov coil array. The frequency of the mode is higher than the GAM frequency estimated using parameters of bulk plasmas, and the high frequency GAM can be derived by taking into account the energy distribution function o...
متن کاملRole of the geodesic acoustic mode shearing feedback loop in transport bifurcations and turbulence spreading
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 role in the L-H transition, and the role of the GAM wave group propagation in turbulence spreading. Using a wavekinetic modulational analysis, the response of the turbulence intensity field to the GAM is calculated...
متن کاملLinear Properties and Nonlinear Frequency Chirping of Energetic Particle Driven Geodesic Acoustic Mode in LHD
Linear Properties and nonlinear frequency chirping of energetic particle driven geodesic acoustic mode (EGAM) is investigated using a hybrid simulation code for energetic particles interacting with a magnetohydrodynamic fluid. It is found that the EGAM is a global mode with the spatially uniform oscillation frequency. The poloidal mode numbers of poloidal velocity fluctuation, plasma density fl...
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ژورنال
عنوان ژورنال: Plasma and Fusion Research
سال: 2009
ISSN: 1880-6821
DOI: 10.1585/pfr.4.014