RESISTIVE TOROIDAL STABILITY OF INTERNAL KINK MODES IN CIRCULAR AND SHAPED TOKAMAKS

被引：107

作者：

BONDESON, A ^{[1
]}

VLAD, G ^{[1
]}

LUTJENS, H ^{[1
]}

机构：

[1] CTR RIC ENERGIA FRASCATI,ENTE NAZL ENERGIE ALTERNAT FUS,ASSOC EURATOM,I-00044 FRASCATI,ITALY

来源：

PHYSICS OF FLUIDS B-PLASMA PHYSICS | 1992年 / 4卷 / 07期

关键词：

D O I：

10.1063/1.860041

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 linear resistive magnetohydrodynamical stability of the n = 1 internal kink mode in tokamaks is studied numerically. The stabilizing influence of small aspect ratio [Holmes et al., Phys. Fluids B 1, 788 (1989)] is confirmed, but it is found that shaping of the cross section influences the internal kink mode significantly. For finite pressure and small resistivity, curvature effects at the q= 1 surface make the stability sensitively dependent on shape, and ellipticity is destabilizing. Only a very restricted set of finite pressure equilibria is completely stable for q0 < 1. A typical result is that the resistive kink mode is slowed down by toroidal effects to a weak resistive tearing/interchange mode. It is suggested that weak resistive instabilities are stabilized during the ramp phase of the sawteeth by effects not included in linear resistive magnetohydrodynamics. Possible mechanisms for triggering a sawtooth crash are discussed.

引用

页码：1889 / 1900

页数：12

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