Nonlocal analysis of the excitation of the geodesic acoustic mode by drift waves

P.N. Guzdar; R.G. Kleva; N. Chakrabarti; Volker Naulin; Jens Juul Rasmussen; P.K. Kaw; R. Singh

doi:10.1063/1.3143125

Nonlocal analysis of the excitation of the geodesic acoustic mode by drift waves

P.N. Guzdar, R.G. Kleva, N. Chakrabarti, Volker Naulin, Jens Juul Rasmussen, P.K. Kaw, R. Singh

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Abstract

The geodesic acoustic modes (GAMs) are typically observed in the edge region of toroidal plasmas. Drift waves have been identified as a possible cause of excitation of GAMs by a resonant three wave parametric process. A nonlocal theory of excitation of these modes in inhomogeneous plasmas typical of the edge region of tokamaks is presented in this paper. The continuum GAM modes with coupling to the drift waves can create discrete "global" unstable eigenmodes localized in the edge "pedestal" region of the plasma. Multiple resonantly driven unstable radial eigenmodes can coexist on the edge pedestal.

Original language	English
Journal	Physics of Plasmas
Volume	16
Issue number	5
Pages (from-to)	052514
ISSN	1070-664X
DOIs	https://doi.org/10.1063/1.3143125
Publication status	Published - 2009

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Copyright (2009) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

Keywords

Fusion energy

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title = "Nonlocal analysis of the excitation of the geodesic acoustic mode by drift waves",

abstract = "The geodesic acoustic modes (GAMs) are typically observed in the edge region of toroidal plasmas. Drift waves have been identified as a possible cause of excitation of GAMs by a resonant three wave parametric process. A nonlocal theory of excitation of these modes in inhomogeneous plasmas typical of the edge region of tokamaks is presented in this paper. The continuum GAM modes with coupling to the drift waves can create discrete {"}global{"} unstable eigenmodes localized in the edge {"}pedestal{"} region of the plasma. Multiple resonantly driven unstable radial eigenmodes can coexist on the edge pedestal.",

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AU - Guzdar, P.N.

AU - Kleva, R.G.

AU - Chakrabarti, N.

AU - Naulin, Volker

AU - Juul Rasmussen, Jens

AU - Kaw, P.K.

AU - Singh, R.

N1 - Copyright (2009) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

PY - 2009

Y1 - 2009

N2 - The geodesic acoustic modes (GAMs) are typically observed in the edge region of toroidal plasmas. Drift waves have been identified as a possible cause of excitation of GAMs by a resonant three wave parametric process. A nonlocal theory of excitation of these modes in inhomogeneous plasmas typical of the edge region of tokamaks is presented in this paper. The continuum GAM modes with coupling to the drift waves can create discrete "global" unstable eigenmodes localized in the edge "pedestal" region of the plasma. Multiple resonantly driven unstable radial eigenmodes can coexist on the edge pedestal.

AB - The geodesic acoustic modes (GAMs) are typically observed in the edge region of toroidal plasmas. Drift waves have been identified as a possible cause of excitation of GAMs by a resonant three wave parametric process. A nonlocal theory of excitation of these modes in inhomogeneous plasmas typical of the edge region of tokamaks is presented in this paper. The continuum GAM modes with coupling to the drift waves can create discrete "global" unstable eigenmodes localized in the edge "pedestal" region of the plasma. Multiple resonantly driven unstable radial eigenmodes can coexist on the edge pedestal.

KW - Fusion energy

KW - Fusionsenergiforskning

KW - Fusionsenergi

U2 - 10.1063/1.3143125

DO - 10.1063/1.3143125

M3 - Journal article

SN - 1070-664X

VL - 16

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JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5

ER -

Nonlocal analysis of the excitation of the geodesic acoustic mode by drift waves

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