UKAEA Papers

"Torque balance and rotational stabilization of the resistive wall mode"

• C. G. Gimblett
• R. J. Hastie

A model is developed to analyze the stabilization of the resistive wall mode (RWM) by plasma rotation. Central to the model is a cylindrical plasma that is ideal magnetohydrodynamic unstable in the absence of a wall, and possesses an internal resonance [J. M. Finn, Phys. Plasmas 2 , 198 (1995)]. This system is then a qualitative model for the actua…

"Resistive wall mode stabilization in toroidal geometry"

• A. Bondeson
• C. G. Gimblett
• R. J. Hastie

The possibility of stabilizing ideal magnetohydrodynamical (MHD) instabilities by resistive walls and slow plasma rotation (rotation frequencies comparable to resistive tearing growth rates) was proposed recently by Finn [Phys. Plasmas 2 , 3782 (1995)] on the basis of cylindrical theory. In the present paper we analyze toroidal effects (pressure gr…

"The influence of fast ions on the magnetohydrodynamic stability of negative shear profiles"

• P. Helander
• C. G. Gimblett
• R. J. Hastie
• K. G. McClements

"Nonuniform rotation and the resistive wall mode"

• C. G. Gimblett
• R. J. Hastie
• R. A. M. Van Der Linden
• J. A. Wesson

Advanced Tokamak Concepts [C. Kessel, J. Manickam, G. Rewoldt, and W. M. Tang, Phys. Rev. Lett. 72 , 1212 (1994)] have been designed assuming that the ‘‘Resistive Wall Mode’’ (RWM) is stable. It has recently been shown that the RWM can be stabilized by a combination of strong uniform plasma rotation and visco-resistive dissipation. In this …

"An analytic study of the magnetohydrodynamic stability of inverse shear profiles"

• C. G. Gimblett
• R. J. Hastie
• T. C. Hender

This paper reports on the ideal magnetohydrodynamic (MHD) stability of tokamak field profiles that have a non-monotonic safety factor q ( r ). An analytic criterion is obtained for these ‘‘inverse shear’’ profiles by expanding in inverse aspect ratio and assuming that the minimum in q is slightly less than the m / n value of the mode under …