DESTABILIZATION OF TOKAMAK PRESSURE-GRADIENT DRIVEN INSTABILITIES BY ENERGETIC ALPHA-PARTICLE POPULATIONS

被引：10

作者：

SPONG, DA ^{[1
]}

HOLMES, JA ^{[1
]}

LEBOEUF, JN ^{[1
]}

CHRISTENSON, PJ ^{[1
]}

机构：

[1] UNIV MICHIGAN,DEPT NUCL ENGN,ANN ARBOR,MI 48109

来源：

FUSION TECHNOLOGY | 1990年 / 18卷 / 03期

关键词：

D O I：

10.13182/FST90-A29285

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

Alpha-particle populations can significantly alter existing magnetohydrodynamic (MHD) instabilities in tokamaks through kinetic effects and coupling to otherwise stable shear Alfven waves. Resonances of the trapped alpha-particle precessional drift, with the usual ballooning mode diamagnetic frequency (ω-*i$//2) and the toroidicity-induced Alfven eigenmode (TAE), are considered. These are examined for noncircular tokamaks in the high-n ballooning limit using an isotropic alpha-particle slowing down distribution and retaining the full-energy and pitch-angle dispersion in the alpha-particle drift frequency. Applying this to the Compact Ignition Tokamak (CIT) and the International Thermonuclear Experimental Reactor (ITER) indicates that ballooning instabilities can persist at betas below the ideal MHD threshold. These are especially dominated by the destabilization of the TAE mode. In addition, a hybrid fluid-particle approach for simulating alpha-particle effects on pressure-gradient driven instabilities is described.

引用

页码：496 / 504

页数：9

共 15 条

[1] FAST-ALPHA DIFFUSION AND THERMALIZATION IN TOKAMAK REACTORS [J].