Rotation effect on geodesic and zonal flow modes in tokamak plasmas with isothermal magnetic surfaces

被引：11

作者：

Elfimov, A. G. ^{[1
]}

Galvao, R. M. O. ^{[1
]}

Sgalla, R. J. F. ^{[1
]}

机构：

[1] Univ Sao Paulo, Inst Phys, BR-05508900 Sao Paulo, Brazil

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2011年 / 53卷 / 10期

关键词：

ACOUSTIC MODES; WAVES;

D O I：

10.1088/0741-3335/53/10/105003

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 electrostatic geodesic mode oscillations are investigated in rotating large aspect ratio tokamak plasmas with circular isothermal magnetic surfaces. The analysis is carried out within the magnetohydrodynamic model including heat flux to compensate for the non-adiabatic pressure distribution along the magnetic surfaces in plasmas with poloidal rotation. Instead of two standard geodesic modes, three geodesic continua are found. The two higher branches of the geodesic modes have a small frequency up-shift from ordinary geodesic acoustic and sonic modes due to rotation. The lower geodesic continuum is a newzonal flowmode (geodesic Doppler mode) in plasmas with mainly poloidal rotation. Limits to standard geodesic modes are found. Bifurcation of Alfven continuum by geodesic modes at the rational surfaces is also discussed. Due to that, the frequency of combined geodesic continuum extends from the poloidal rotation frequency to the ion-sound band that can have an important role in suppressing plasma turbulence.

引用

页数：7

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