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The aim of this note is to show that in toroidal plasma containment systems the condition w'(a)>0 (for p'(a)<0) where w=(2p+ mod B mod 2 ) should be considered as characterising a 'magnetic well' or minimum B configuration rather than the condition V"( Phi )<0.
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V. D. Shafranov (1971) studied this question.
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