Stability of Modified Bumpy Torus

Abstract

Stability of long wave length toroidal theta pinch with l=0, l=±1, and l=±2 corrugating magnetic field is investigated with the aid of the sharp boundary-constant pressure model. The stability criterion is obtained for the outward derivative of the specific volume (Remark: Graphics omitted.) with respect to the magnetic field without plasma to be negative on the plasma-vacuum surface. It is also found that the growth rate of the n=0, m=1 mode to vertical and horizontal displacement is different.