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Effects of Rotation on Ideal Ballooning Modes
Author(s) -
Sen S.
Publication year - 1994
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.2150340227
Subject(s) - ballooning , toroid , rotation (mathematics) , physics , asymmetry , instability , flux (metallurgy) , kink instability , centrifugal force , ideal (ethics) , mechanics , plasma , classical mechanics , tokamak , rotational speed , materials science , geometry , plasma instability , quantum mechanics , mathematics , philosophy , epistemology , metallurgy
The 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 < L p , where L p 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 > L p ). 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.