Stabilization of the resistive wall mode in DIII-D by plasma rotation and magnetic feedback

被引:58
作者
Okabayashi, M
Bialek, J
Chance, MS
Chu, MS
Fredrickson, ED
Garofalo, AM
Hatcher, R
Jensen, TH
Johnson, LC
La Haye, RJ
Navratil, GA
Reimerdes, H
Scoville, JT
Strait, EJ
Turnbull, AD
Walker, ML
机构
[1] Princeton Plasma Phys Lab, Princeton, NJ 08544 USA
[2] Columbia Univ, New York, NY 10027 USA
[3] Gen Atom Co, San Diego, CA 92186 USA
关键词
D O I
10.1088/0741-3335/44/12B/324
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
Suppression of the resistive wall mode (RWM) has been successfully demonstrated in the DIII-D tokamak by using rotational stabilization in conjunction with a close-fitting vacuum vessel wall. The duration of the high-pressure discharge was extended to hundreds of times the wall skin time. Frequently, the plasma pressure reached the ideal-wall magnetohydrodynamic (MHD) kink limit. The confined pressure is up to twice as high as the no-wall ideal MHD kink limit. Near its marginal stability point, the RWM is found to resonate with residual non-axisymmetric fields (e.g. components of the error field). A magnetic feedback system has been used to identify and compensate for the residual non-axisymmetric fields. This is to the best of our knowledge, the first demonstration of the sustainment of a stable plasma with pressure at levels well above the no-wall pressure limit. This technique is expected to be applicable to other toroidal devices.
引用
收藏
页码:B339 / B355
页数:17
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