Geodesic acoustic  modes excited  by finite beta  drift waves

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

doi:10.1063/1.3028311

Geodesic acoustic modes excited by finite beta drift waves

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

University of Maryland, College Park

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Abstract

Presented in this paper is a mode-coupling analysis for the nonlinear excitation of the geodesic acoustic modes (GAMs) in tokamak plasmas by finite beta drift waves. The finite beta effects give rise to a strong stabilizing influence on the parametric excitation process. The dominant finite beta effect is the combination of the Maxwell stress, which has a tendency to cancel the primary drive from the Reynolds stress, and the finite beta modification of the drift waves. The zonal magnetic field is also excited at the GAM frequency. However, it does not contribute to the overall stability of the three-wave process for parameters of relevance to the edge region of tokamaks.

Original language	English
Journal	Physics of Plasmas
Volume	15
Issue number	11
Pages (from-to)	112310
ISSN	1070-664X
DOIs	https://doi.org/10.1063/1.3028311
Publication status	Published - 2008

Bibliographical note

Copyright (2008) 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

EXCITATION
ZONAL FLOWS
EXPLANATION
N=0 CHIRPING MODE
ALFVEN TURBULENCE
TOKAMAK
PLASMAS

Access to Document

10.1063/1.3028311

KlevaFinal published version, 135 KB

http://link.aip.org/link/PHPAEN/v15/i11/p112310/s1

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Cite this

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title = "Geodesic acoustic modes excited by finite beta drift waves",

abstract = "Presented in this paper is a mode-coupling analysis for the nonlinear excitation of the geodesic acoustic modes (GAMs) in tokamak plasmas by finite beta drift waves. The finite beta effects give rise to a strong stabilizing influence on the parametric excitation process. The dominant finite beta effect is the combination of the Maxwell stress, which has a tendency to cancel the primary drive from the Reynolds stress, and the finite beta modification of the drift waves. The zonal magnetic field is also excited at the GAM frequency. However, it does not contribute to the overall stability of the three-wave process for parameters of relevance to the edge region of tokamaks.",

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note = "Copyright (2008) 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.",

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AU - Chakrabarti, Nikhil Kumar

AU - Guzdar, P.N.

AU - Kleva, R.G.

AU - Naulin, Volker

AU - Juul Rasmussen, Jens

AU - Kaw, P.K

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PY - 2008

Y1 - 2008

N2 - Presented in this paper is a mode-coupling analysis for the nonlinear excitation of the geodesic acoustic modes (GAMs) in tokamak plasmas by finite beta drift waves. The finite beta effects give rise to a strong stabilizing influence on the parametric excitation process. The dominant finite beta effect is the combination of the Maxwell stress, which has a tendency to cancel the primary drive from the Reynolds stress, and the finite beta modification of the drift waves. The zonal magnetic field is also excited at the GAM frequency. However, it does not contribute to the overall stability of the three-wave process for parameters of relevance to the edge region of tokamaks.

AB - Presented in this paper is a mode-coupling analysis for the nonlinear excitation of the geodesic acoustic modes (GAMs) in tokamak plasmas by finite beta drift waves. The finite beta effects give rise to a strong stabilizing influence on the parametric excitation process. The dominant finite beta effect is the combination of the Maxwell stress, which has a tendency to cancel the primary drive from the Reynolds stress, and the finite beta modification of the drift waves. The zonal magnetic field is also excited at the GAM frequency. However, it does not contribute to the overall stability of the three-wave process for parameters of relevance to the edge region of tokamaks.

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KW - ALFVEN TURBULENCE

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KW - PLASMAS

KW - Energiteknologier på vej

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