Stabilization of kink instabilities by eddy currents in a segmented wall and comparison with ideal MHD theory

被引：21

作者：

Garofalo, AM ^{[1
]}

Eisner, E ^{[1
]}

Ivers, TH ^{[1
]}

Kombargi, R ^{[1
]}

Mauel, ME ^{[1
]}

Maurer, D ^{[1
]}

Nadle, D ^{[1
]}

Navratil, GA ^{[1
]}

Sankar, MKV ^{[1
]}

Taylor, E ^{[1
]}

Xiao, Q ^{[1
]}

机构：

[1] Columbia Univ, Dept Appl Phys, New York, NY 10027 USA

来源：

NUCLEAR FUSION | 1998年 / 38卷 / 07期

关键词：

D O I：

10.1088/0029-5515/38/7/306

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 characteristics of external kink instabilities observed during wall stabilization studies in the HBT-EP tokamak have been compared with the predictions of ideal MHD theory, in order to examine the stabilizing role of a resistive wall that is segmented both toroidally and poloidally. The reconstructed equilibria, for discharges with different plasma-wall configurations, are consistent with external and internal magnetic measurements, measured soft X ray profiles and measured equilibrium wall eddy currents. The stability analysis of these equilibria predicts patterns of instability induced eddy currents for a model wall that is continuous and perfectly conducting, and these patterns are in good agreement with the ones observed on the HBT-EP segmented nail. These eddy currents account for the observed stabilization of fast ideal modes when the wall is fully inserted, consistent with the prediction of marginal stability.

引用

页码：1029 / 1042

页数：14

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