Kinetic ballooning modes in tokamaks and stellarators

被引：24
|
作者：
Aleynikova, K. [1 ,2 ]
Zocco, A. [1 ]
Xanthopoulos, P. [1 ]
Helander, P. [1 ]
Nuehrenberg, C. [1 ]
机构：
[1] EURATOM, Max Planck Inst Plasmaphys, Greifswald, Germany
[2] Moscow Inst Phys & Technol, Dolgoprudnyi, Russia
来源：
JOURNAL OF PLASMA PHYSICS | 2018年 / 84卷 / 06期
基金：
欧盟地平线“2020”;
关键词：
fusion plasma; plasma instabilities; plasma simulation; SIMULATIONS; COMPRESSIBILITY; TURBULENCE;
D O I：
10.1017/S0022377818001186
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：
Kinetic ballooning modes (KBMs) are investigated by means of linear electromagnetic gyrokinetic (GK) simulations in the stellarator Wendelstein 7-X (W7-X), for high-beta plasmas, where beta is the ratio of thermal to magnetic plasma pressure. The analysis shows suppression of ion-temperature-gradient (ITG) and trapped particle modes (TEM) by finite-beta effects and destabilization of KBMs at high beta. The results are compared with a generic tokamak case. We show that, for large pressure gradients, the frequency of KBMs evaluated by the GENE code is in agreement with the analytical prediction of the diamagnetic modification of the ideal magnetohydrodynamic limit in W7-X general geometry. Thresholds for destabilization of the KBM are predicted for different W7-X equilibrium configurations. We discuss the relation of these thresholds to the ideal magnetohydrodynamic (MI1D) stability properties of the corresponding equilibria.
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页数：16
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