Cross-code gyrokinetic verification and benchmark on the linear collisionless dynamics of the geodesic acoustic mode
Sign Up to like & getrecommendations! Published in 2017 at "Physics of Plasmas"
DOI: 10.1063/1.4985571
Abstract: The linear properties of the geodesic acoustic modes (GAMs) in tokamaks are investigated by means of the comparison of analytical theory and gyrokinetic numerical simulations. The dependence on the value of the safety factor, finite-orbit-width… read more here.
Keywords: cross code; mode; geodesic acoustic; code ... See more keywords
Investigation of electromagnetic geodesic acoustic mode in EAST RF-heating plasma
Sign Up to like & getrecommendations! Published in 2018 at "Physics of Plasmas"
DOI: 10.1063/1.5022341
Abstract: The magnetic fluctuations of geodesic acoustic modes (GAMs) have been investigated using a Doppler backscattering system and Mirnov probes during ion cyclotron resonance heating and lower hybrid wave heating in the edge plasma in the… read more here.
Keywords: mode; geodesic acoustic; field fluctuations; edge ... See more keywords
Kinetic effects on geodesic acoustic modes and Stringer spin-up driven by a poloidally asymmetric particle source
Sign Up to like & getrecommendations! Published in 2023 at "Physics of Plasmas"
DOI: 10.1063/5.0148895
Abstract: The impact of the poloidally inhomogeneous particle source on the onset of Stringer spin-up (SSU) and geodesic acoustic mode (GAM) is investigated. Using a gyrofluid model with Hammet–Perkins closure, it was found that Landau damping… read more here.
Keywords: geodesic acoustic; source; particle source; model ... See more keywords
Generation of geodesic acoustic mode by nonlinear coupling of magnetic island and island-driven beta-induced Alfvén eigenmode
Sign Up to like & getrecommendations! Published in 2017 at "Plasma Physics and Controlled Fusion"
DOI: 10.1088/1361-6587/aa7646
Abstract: In a recent work, we have shown that the plasma flow around the magnetic island can excite the beta-induced Alfven eigenmode (BAE) (Marchenko et al 2016 Nucl. Fusion 56 106021). In the present communication, it… read more here.
Keywords: geodesic acoustic; magnetic island; acoustic mode; island ... See more keywords
Experimental observations of modes with geodesic acoustic character from the core to the edge in the TCV tokamak
Sign Up to like & getrecommendations! Published in 2018 at "Plasma Physics and Controlled Fusion"
DOI: 10.1088/1361-6587/aaa71d
Abstract: The geodesic acoustic mode (GAM) is a coherently oscillating mode, related to the zonal flows that can regulate turbulence in magnetized toroidal plasmas. Modes possessing geodesic acoustic character have been widely observed in the TCV… read more here.
Keywords: acoustic character; geodesic acoustic; edge; tcv tokamak ... See more keywords
Singular global components and frequency shift of the geodesic acoustic continuum modes in shaped tokamaks
Sign Up to like & getrecommendations! Published in 2019 at "Plasma Physics and Controlled Fusion"
DOI: 10.1088/1361-6587/ab1d22
Abstract: Within the ideal magnetohydrodynamic (MHD) model, the geodesic acoustic modes (GAMs) in tokamaks derived by Winsor et al (1968 Phys. Fluids 11 2448) belong to the continuous spectrum, characterised ... read more here.
Keywords: shift geodesic; components frequency; frequency shift; geodesic acoustic ... See more keywords
Electromagnetic characteristics of geodesic acoustic mode in the COMPASS tokamak
Sign Up to like & getrecommendations! Published in 2017 at "Nuclear Fusion"
DOI: 10.1088/1741-4326/aa897e
Abstract: Axisymmetric geodesic acoustic mode (GAM) oscillations of the magnetic field, plasma potential and electron temperature have been identified on the COMPASS tokamak. This work brings an overview of their electromagnetic properties studied by multi-pin reciprocating… read more here.
Keywords: compass tokamak; mode; geodesic acoustic; acoustic mode ... See more keywords
Investigation of the geodesic acoustic mode in EAST H-mode operation using Doppler backscattering systems
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DOI: 10.1088/1741-4326/aad249
Abstract: The geodesic acoustic mode (GAM) has been observed for the first time in EAST H-mode operation using Doppler backscattering (DBS) systems. The poloidal and toroidal symmetries of the radial electric field (Er) fluctuation (m =… read more here.
Keywords: mode; geodesic acoustic; east mode; acoustic mode ... See more keywords
Finite-Larmor-radius-induced global geodesic acoustic modes—a two-fluid model
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DOI: 10.1088/1741-4326/ac17c1
Abstract: A linear theory of ion finite-Larmor-radius (FLR)-induced global geodesic acoustic modes (GAMs) based on the electrostatic two-fluid model is developed, in which modest ion FLR effects are encompassed through polarization drifts. The radial differential equation… read more here.
Keywords: geodesic acoustic; finite larmor; model; induced global ... See more keywords