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In the theoretical description of the neoclassical tearing mode it is usually assumed that the ion banana width wb is much smaller than the island width W. This assumption is questionable at least for the island size at the mode onset. We show that a significant fraction of the (ion) bootstrap current survives inside the island when wb is comparable to W. This effect also leads to a linear scaling of beta (onset/theta) with the normalised ion poloidal gyroradius rho theta*, in agreement with the experimental results of ASDEX Upgrade.

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Authors: POLI E, Max-Planck-Institut für Plasmaphysik, Garching (DE);PEETERS A G, Max-Planck-Institut für Plasmaphysik, Garching (DE);BERGMANN A ET AL, Max-Planck-Institut für Plasmaphysik, Garching (DE)
Bibliographic Reference: An article published in: Physical Review Letters, 88, 075001 (2002)
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