Session KP01 - Poster Session III.
POSTER session, Tuesday afternoon, March 23
Exhibit Hall, GWCC
It is well known that the combined effects of dissipation and toroidal rotation suppress resistive wall modes in tokamaks. There are two classes of resistive wall modes: the resistive-wall tearing modes (RWTMs) and the ideal-plasma resistive-wall modes (IPRWMs). The RWTMs are stabilized by a slow plasma rotation with a frequency greater than the inverse wall magnetic diffusion time while the IPRWMs require a fast toroidal rotation frequency of a few percents of the Alfven frequency. In this work, we have studied the effect of poloidal rotation on the stability of the IPRWMs. The analysis is carried out using the sharp boundary model of Ref. [1] including high beta, plasma resistivity, toroidicity and sound wave continuum resonances. It is shown here that poloidal rotation can suppress the IPRWMs and its stabilizing effect is q(a) (safety factor at the plasma edge) times greater than toroidal rotation. The effect of multiple resonances with the Alfven and sound wave continuum is also investigated by increasing the edge safety factor above three while keeping the central q equal to unity. This work was supported by the Department of Energy under grant No. DE-FG02-93ER54215.
[1] R. Betti, Phys. Plasmas 10, 3615 (1998)