Geodesic acoustic modes excited by finite beta drift waves

被引：24

作者：

Chakrabarti, N. ^{[1
]}

Guzdar, P. N. ^{[2
]}

Kleva, R. G. ^{[2
]}

Naulin, V. ^{[3
]}

Rasmussen, J. J. ^{[3
]}

Kaw, P. K. ^{[4
]}

机构：

[1] Saha Inst Nucl Phys, Kolkata 700064, India

[2] Univ Maryland, Inst Res Elect & Appl Phys, College Pk, MD 20742 USA

[3] Tech Univ Denmark, Riso Natl Lab Sustainable Energy, Riso DTU, EURATOM Assoc, DK-4000 Roskilde, Denmark

[4] Inst Plasma Res, Bhat 384424, Gandhinagar, India

来源：

PHYSICS OF PLASMAS | 2008年 / 15卷 / 11期

关键词：

plasma drift waves; plasma instability; plasma nonlinear processes; plasma toroidal confinement; Tokamak devices;

D O I：

10.1063/1.3028311

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

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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页数：5

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