Microtearing modes in tokamak discharges

被引:22
|
作者
Rafiq, T. [1 ]
Weiland, J. [2 ]
Kritz, A. H. [1 ]
Luo, L. [3 ]
Pankin, A. Y. [4 ]
机构
[1] Lehigh Univ, Dept Phys, Bldg 16, Bethlehem, PA 18015 USA
[2] Chalmers Univ, Dept Appl Phys, S-41296 Gothenburg, Sweden
[3] IBM Res, Oak Ridge, TN 37831 USA
[4] Tech X Corp, Boulder, CO 80308 USA
关键词
TRANSPORT; FLUCTUATIONS; PLASMA;
D O I
10.1063/1.4953609
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
Microtearing modes (MTMs) have been identified as a source of significant electron thermal transport in tokamak discharges. In order to describe the evolution of these discharges, it is necessary to improve the prediction of electron thermal transport. This can be accomplished by utilizing a model for transport driven by MTMs in whole device predictive modeling codes. The objective of this paper is to develop the dispersion relation that governs the MTM driven transport. A unified fluid/kinetic approach is used in the development of a nonlinear dispersion relation for MTMs. The derivation includes the effects of electrostatic and magnetic fluctuations, arbitrary electron-ion collisionality, electron temperature and density gradients, magnetic curvature, and the effects associated with the parallel propagation vector. An iterative nonlinear approach is used to calculate the distribution function employed in obtaining the nonlinear parallel current and the nonlinear dispersion relation. The third order nonlinear effects in magnetic fluctuations are included, and the influence of third order effects on a multi-wave system is considered. An envelope equation for the nonlinear microtearing modes in the collision dominant limit is introduced in order to obtain the saturation level. In the limit that the mode amplitude does not vary along the field line, slab geometry, and strong collisionality, the fluid dispersion relation for nonlinear microtearing modes is found to agree with the kinetic dispersion relation. Published by AIP Publishing.
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页数:8
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