Global geodesic acoustic mode in a tokamak with positive magnetic shear and a monotonic temperature profile

被引：15

作者：

Ilgisonis, V. I. ^{[1
,2
]}

Khalzov, I. V. ^{[3
]}

Lakhin, V. P. ^{[1
]}

Smolyakov, A. I. ^{[1
,4
]}

Sorokina, E. A. ^{[1
,2
]}

机构：

[1] NRC Kurchatov Inst, Moscow, Russia

[2] Peoples Friendship Univ Russia, Moscow, Russia

[3] Univ Wisconsin, Madison, WI 53706 USA

[4] Univ Saskatchewan, Saskatoon, SK, Canada

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2014年 / 56卷 / 03期

基金：

加拿大自然科学与工程研究理事会;

关键词：

tokamak; GAM; MHD; ZONAL FLOWS; EXPLANATION;

D O I：

10.1088/0741-3335/56/3/035001

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：

The analytical solution for global geodesic acoustic modes (GGAMs) in a tokamak with a positive magnetic shear profile and a monotonic temperature profile is found in the framework of magnetohydrodynamic theory. The axisymmetric eigenvalue problem for perturbed pressure and electrostatic potential is formulated as a recurrent set of equations for poloidal Fourier harmonics. The integral condition for the existence of GGAMs is obtained. It is shown that the traditional paradigm of having a off-axis maximum of the local geodesic acoustic frequency is not necessary for the existence of GGAMs; a representative example is designed.

引用

页数：7

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