The maximum amplitude of the $m=2$ tearing mode in tokamaks is found to increase rapidly with rising safety factor at the magnetic axis, $q(0)$. The resulting large magnetic islands encompass virtually the entire plasma cross section for 1.5q(0)1.8 and are shown to be related to the vacuum bubbles formed during the saturation of the ideal $m=2$ kink mode. On the basis of these results, a mechanism for major distruptions is proposed along with a possible method for their elimination.
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Drake et al. (1984) studied this question.
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