On the dynamics of vortex modes within magnetic islands

被引：31

作者：

Hornsby, W. A. ^{[1
]}

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

Siccinio, M. ^{[2
]}

Poli, E. ^{[2
]}

机构：

[1] Univ Bayreuth, Dept Phys, D-95447 Bayreuth, Germany

[2] Max Planck Inst Plasma Phys, D-85748 Garching, Germany

来源：

PHYSICS OF PLASMAS | 2012年 / 19卷 / 03期

基金：

英国工程与自然科学研究理事会;

关键词：

GEODESIC ACOUSTIC MODE; ZONAL FLOWS; TURBULENCE; OSCILLATIONS;

D O I：

10.1063/1.3692094

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：

Recent work investigating the interaction of magnetic islands with micro-turbulence has uncovered the striking observation of large scale vortex modes forming within the island structure [W. A. Hornsby et al., Phys. Plasmas 17, 092301 (2010)]. These electrostatic vortices are found to be the size of the island and are oscillatory. It is this oscillatory behaviour and the presence of turbulence that leads us to believe that the dynamics are related to the geodesic acoustic mode (GAM), and it is this link that is investigated in this paper. Here, we derive an equation for the GAM in the MHD limit, in the presence of a magnetic island modified three-dimensional axisymmetric geometry. The eigenvalues and eigenfunctions are calculated numerically and then utilised to analyse the dynamics of oscillatory large-scale electrostatic potential structures seen in both linear and non-linear gyro-kinetic simulations. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3692094]

引用

页数：9

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