The computation of perturbed plasma equilibria is required to assess the properties of resistive wall modes and to investigate the driving of magnetic islands in toroidal plasmas by external field errors. The computation of perturbed equilibria using the so-called δW techniques of magnetohydrodynamic (MHD) stability codes is explained. The theory is developed that is required to use the results of a perturbed equilibrium calculation for either a study of resistive wall modes or of the elimination of magnetic islands by the use of trim coils.
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Allen H. Boozer (1999) studied this question.
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