A current-driven electromagnetic mode in sheared and toroidal configurations

被引：3

作者：

Pusztai, Istvan ^{[1
,2
]}

Catto, Peter J. ^{[1
]}

Parra, Felix I. ^{[1
,3
]}

Barnes, Michael ^{[1
,4
]}

机构：

[1] MIT, Plasma Sci & Fus Ctr, Cambridge, MA 02139 USA

[2] Chalmers, Dept Appl Phys, SE-41296 Gothenburg, Sweden

[3] Univ Oxford, Dept Phys, Oxford OX1 3PU, England

[4] Univ Texas Austin, Dept Phys, Austin, TX 78712 USA

来源：

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

关键词：

kink mode; gyrokinetic; current gradient; instability; simulation; PLASMA; INSTABILITIES; STABILITY;

D O I：

10.1088/0741-3335/56/3/035011

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 induced electric field in a tokamak drives a parallel electron current flow. In an inhomogeneous, finite beta plasma, when this electron flow is comparable to the ion thermal speed, the Alfven mode wave solutions of the electromagnetic gyrokinetic equation can become nearly purely growing kink modes. Using the new 'low-flow' version of the gyrokinetic code GS2 developed for momentum transport studies (Barnes et al 2013 Phys. Rev. Lett. 111 055005), we are able to model the effect of the induced parallel electric field on the electron distribution to study the destabilizing influence of current on stability. We identify high mode number kink modes in GS2 simulations and make comparisons to analytical theory in sheared magnetic geometry. We demonstrate reassuring agreement with analytical results both in terms of parametric dependences of mode frequencies and growth rates, and regarding the radial mode structure.

引用

页数：11

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