Abstract
AbstractThe stability of ideal ballooning modes in presence of a rigid toroidal rotation is revisited. Centrifugal forces induce poloidal asymmetry in the equilibrium pressure and affect the shape of the flux surfaces. Taking this two effects into account shows that the rigid rotation has a stabilising role on the the inner flux surfaces (for which r < Lp, where Lp is the pressure scale length). On the other hand, rotation is shown to have a destabilising role on the outer flux surfaces (for which r > Lp). However, the instability at the outer plasma is found to be terminated by a new stable zone which may be conjectured to be a “third” region of stability.
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