Stability of localized modes in rotating tokamak plasmas

J. W. Haverkort; H. J. De Blank

doi:10.1088/0741-3335/53/4/045008

Stability of localized modes in rotating tokamak plasmas

J. W. Haverkort, H. J. De Blank

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9 Citations (Scopus)

Abstract

The ideal magnetohydrodynamic stability is investigated of localized interchange modes in a large-aspect ratio tokamak plasma. The resulting stability criterion includes the effects of toroidal rotation and rotation shear and contains various well-known limiting cases. The analysis allows for a general adiabatic index, resulting in a stabilizing contribution from the convective effect. A further stabilizing effect from rotation exists when the angular frequency squared decreases radially more rapidly than the density. Flow shear, however, also decreases the stabilizing effect of magnetic shear through the Kelvin-Helmholtz mechanism. Numerical simulations reveal the merits and limitations of the performed local analysis.

Original language	English
Article number	045008
Journal	Plasma Physics and Controlled Fusion
Volume	53
Issue number	4
DOIs	https://doi.org/10.1088/0741-3335/53/4/045008
Publication status	Published - 1 Apr 2011
Externally published	Yes

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AB - The ideal magnetohydrodynamic stability is investigated of localized interchange modes in a large-aspect ratio tokamak plasma. The resulting stability criterion includes the effects of toroidal rotation and rotation shear and contains various well-known limiting cases. The analysis allows for a general adiabatic index, resulting in a stabilizing contribution from the convective effect. A further stabilizing effect from rotation exists when the angular frequency squared decreases radially more rapidly than the density. Flow shear, however, also decreases the stabilizing effect of magnetic shear through the Kelvin-Helmholtz mechanism. Numerical simulations reveal the merits and limitations of the performed local analysis.

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Stability of localized modes in rotating tokamak plasmas

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