Geodesic acoustic modes in tokamak plasmas with a radial equilibrium electric field

Zhou, Deng

doi:10.1063/1.4930132

Cited by 7 publications

(8 citation statements)

References 28 publications

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“…Both frequencies and damping rates increase with respect to the poloidal Mach number. The tendencies are qualitatively in accordance with the previous work [5] where the potential side-band effect was not included. A intuitive explanation for this changing trend with M p was also given in [15].…”

Section: Numerical Solution To the Dispersion Relationsupporting

confidence: 91%

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Geodesic acoustic modes in tokamak plasmas with anisotropic distribution and a radial equilibrium electric field

Yue¹,

Zhou²,

Wang

2018

Plasma Sci. Technol.

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Kinetic theory of geodesic acoustic modes in toroidal plasmas: a brief review Zhiyong QIU, Liu CHEN and Fulvio ZONCA -GAMs and ZFs in rotating large-aspectratio tokamak plasmas V I Ilgisonis, V P Lakhin, A I Smolyakov et al. - AbstractThe dispersion relation of standard geodesic acoustic modes in tokamak plasmas with anisotropic distribution and a radial equilibrium electric field is derived and analyzed. Both frequencies and damping rates increase with respect to the poloidal Mach number which indicates the strength of the radial electric field. The strength of anisotropy is denoted by the ratio of the parallel temperature T  ( ) to the perpendicular temperature T .( ) It is shown that, when the parallel temperature is lower than the perpendicular temperature, the enhanced anisotropy tends to enlarge the real frequency but reduces the damping rate, and when the parallel temperature is higher than the perpendicular temperature, the effect is opposite. The radial equilibrium electric field has stronger effect on the frequency and damping rate for the case with higher parallel temperature than the case with higher perpendicular temperature.

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Section: Numerical Solution To the Dispersion Relationsupporting

confidence: 91%

“…In theory, Zhou [5] investigated the GAM with a radial equilibrium electric field and found that the real frequency and damping rate do increase with the increasing poloidal Mach number. He also investigated the effect of magnetic perturbation on GAMs [6].…”

Section: Introductionmentioning

confidence: 99%

Geodesic acoustic modes in tokamak plasmas with anisotropic distribution and a radial equilibrium electric field

Yue¹,

Zhou²,

Wang

2018

Plasma Sci. Technol.

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“…stronger GAM in rotating plasmas, independent of the flow orientation [489]. Likewise, the inclusion of an equilibrium radial electric field in the GK framework [490] resulted in multiple branches of zonal eigenmodes, including a GAM, SW and a ZFO, similar to the fluid model with poloidal mass flow. Both the GAM frequency and collisionless damping rates increase with strengthening E r velocity (which was expressed in terms of a poloidal Mach number), while the ZFO frequency and damping slightly decrease.…”

Section: Damping and Amplitudementioning

confidence: 97%

“…Both the GAM frequency and collisionless damping rates increase with strengthening E r velocity (which was expressed in terms of a poloidal Mach number), while the ZFO frequency and damping slightly decrease. A tentative comparison was also made with AUG experimental results but with contradictory behaviour to the Guo model above [490].…”

Section: Damping and Amplitudementioning

confidence: 97%

Geodesic acoustic modes in magnetic confinement devices

Smolyakov

Ido

2021

Nucl. Fusion

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Geodesic acoustic modes (GAMs) are ubiquitous oscillatory flow phenomena observed in toroidal magnetic confinement fusion plasmas, such as tokamaks and stellarators. They are recognized as the non-stationary branch of the turbulence driven zonal flows which play a critical regulatory role in cross-field turbulent transport. GAMs are supported by the plasma compressibility due to magnetic geodesic curvature—an intrinsic feature of any toroidal confinement device. GAMs impact the plasma confinement via velocity shearing of turbulent eddies, modulation of transport, and by providing additional routes for energy dissipation. GAMs can also be driven by energetic particles (so-called EGAMs) or even pumped by a variety of other mechanisms, both internal and external to the plasma, opening-up possibilities for plasma diagnosis and turbulence control. In recent years there have been major advances in all areas of GAM research: measurements, theory, and numerical simulations. This review assesses the status of these developments and the progress made towards a unified understanding of the GAM behaviour and its role in plasma confinement. The review begins with tutorial-like reviews of the basic concepts and theory, followed by a series of topic orientated sections covering different aspects of the GAM. The approach adopted here is to present and contrast experimental observations alongside the predictions from theory and numerical simulations. The review concludes with a comprehensive summary of the field, highlighting outstanding issues and prospects for future developments.

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“…Poloidal flows due to E × B drift are important for the Geodesic Acoustic Mode (GAM) oscillation [23,38], and can play a role in the experimentally observed edge asymmetries and flow patterns [39,40,41]. In the tokamak coordinate system used here, the poloidal coordinate is transformed into the coordinate parallel to the magnetic field.…”

Section: Poloidal Flowsmentioning

confidence: 99%

Hermes: global plasma edge fluid turbulence simulations

Dudson

Leddy

2017

Plasma Phys. Control. Fusion

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Abstract. The transport of heat and particles in the relatively collisional edge regions of magnetically confined plasmas is a scientifically challenging and technologically important problem. Understanding and predicting this transport requires the self-consistent evolution of plasma fluctuations, global profiles and flows, but the numerical tools capable of doing this in realistic (diverted) geometry are only now being developed.Here a 5-field reduced 2-fluid plasma model for the study of instabilities and turbulence in magnetised plasmas is presented, built on the BOUT++ framework. This cold ion model allows the evolution of global profiles, electric fields and flows on transport timescales, with flux-driven cross-field transport determined self-consistently by electromagnetic turbulence. Developments in the model formulation and numerical implementation are described, and simulations are performed in poloidally limited and diverted tokamak configurations.

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Geodesic acoustic modes in tokamak plasmas with a radial equilibrium electric field

Cited by 7 publications

References 28 publications

Geodesic acoustic modes in tokamak plasmas with anisotropic distribution and a radial equilibrium electric field

Geodesic acoustic modes in tokamak plasmas with anisotropic distribution and a radial equilibrium electric field

Geodesic acoustic modes in magnetic confinement devices

Hermes: global plasma edge fluid turbulence simulations

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