Abstract
The resonance destabilization of the m=1/n=1 internal kink by trapped energetic ions executing potato orbits is considered. Abrupt stabilization is found for δpα>rs, with δpα being the potato width at injection energy and rs the radius of the q=1 surface. The magnetic well in spherical tokamaks stabilizes fishbones even with the finite orbit width effect included, increasing threshold by a factor ∼α, with α≫1 being the magnetic well curvature parameter.
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