Effects of a hollow current profile on the ideal MHD stability of high betaSUBp/SUBplasmas in a tokamak

摘要

The effects of current profiles on the n = 1 internal kink mode, the infinite n ballooning mode and the infernal mode in a tokamak are analysed numerically. The stabilities of plasmas with a circular cross-section and a peaked pressure profile are investigated for three types of current profile, that is parabolic, flat and hollow with an inverted q profile. In a low beta state (p0.5), the growth rate of the n = 1 internal kink mode for the plasma with the hollow current profile becomes larger, and the unstable region spreads to the region of higher qmin(qmin>2). When the plasma has a more peaked pressure profile in the hollow part of the current profile, the unstable regions of the n = 1 internal kink mode and ballooning mode shrink, and the infernal mode disappears