Resistive ferromagnetic wall modes in theory and experiment

被引:17
作者
Pustovitov, V. D. [1 ]
机构
[1] Russian Res Ctr, Kurchatov Inst, Nucl Fus Inst, Moscow 123182, Russia
关键词
dispersion relations; ferromagnetism; magnetic permeability; plasma instability; plasma toroidal confinement; plasma-wall interactions; Tokamak devices; DIII-D; FEEDBACK STABILIZATION; HIGH-BETA; PLASMA ROTATION; ACTIVE CONTROL; TOKAMAK; STABILITY; COILS; RWM;
D O I
10.1063/1.3129803
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
Effects of the ferromagnetic resistive wall on the plasma stability are analyzed. The analysis is based on the equations describing the perturbation dynamics outside the plasma, assuming a linear plasma response. A single-mode cylindrical model is used with two features that differ from the standard case: the wall magnetic permeability is incorporated and the thin-wall approximation is waived. The derivations are performed so that the results can be applied to both tokamaks and line-tied pinches. This is done to allow conclusions for tokamaks from comparison of the developed theory with the experimental data on the resistive and ferromagnetic wall modes in the Wisconsin rotating wall machine with and without a ferritic wall [W. F. Bergerson, D. A. Hannum, C. C. Hegna, R. D. Kendrick, J. S. Sarff, and C. B. Forest, Phys. Rev. Lett. 101, 235005 (2008)]. The model shows that the ferromagnetic wall effect is always destabilizing. However, it must be small under standard conditions in tokamaks. The effect can be much stronger in the pinch with lower magnetic field and larger wall permeability. The dispersion relation obtained here makes possible an explanation of the experimental results available so far, including those from the Wisconsin machine reported recently as strongly contradictory to expectations based on earlier models. Also, an easy practical solution for compensating the destabilizing ferromagnetic effect in tokamaks is proposed.
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页数:10
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