Abstract

It is shown that the increase of β (the ratio of plasma pressure to the magnetic field pressure) may change the character of the influence of trapped energetic ions on MHD stability in spherical tori. Namely, the energetic ions, which stabilize MHD modes (such as the ideal kink mode, collisionless tearing mode and semi-collisional tearing mode) at low β, have a destabilizing influence at high β unless the radial distribution of the energetic ions is very peaked.

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