STUDIES OF IMPURITY MODE AND ION TEMPERATURE-GRADIENT MODE IN TOROIDAL PLASMAS

被引:65
作者
DONG, JQ [1 ]
HORTON, W [1 ]
机构
[1] UNIV TEXAS, INST FUS STUDIES, AUSTIN, TX 78712 USA
关键词
HOT PLASMA; HYDROGEN IONS; ION DENSITY; ION TEMPERATURE; LARMOR RADIUS; PLASMA IMPURITIES; TOKAMAK DEVICES;
D O I
10.1063/1.871123
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 impurity mode and eta(i) mode driven by impurity ions with outwardly peaked density profiles, near the boundary of tokamak plasmas, and the ion temperature gradient, respectively, are studied in high-temperature toroidal plasmas. The gyrokinetic theory is applied and finite Larmor radius effects of both hydrogenic and impurity ions are included. It is found that the impurity mode is enhanced by the ion temperature gradient. In addition, the impurity ions with outwardly peaked density profiles are demonstrated to have destabilizing effects on the eta(i) mode. These two modes are strongly coupled to each other so that it is impossible to distinguish between them when both the driving mechanisms are strong enough to drive the corresponding mode unstable independently, The correlation of the results with nonlinear simulations and the experimental observations are discussed. (C) 1995 American Institute of Physics.
引用
收藏
页码:3412 / 3419
页数:8
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