Pressure driven tearing and interchange modes in the reversed field pinch

In this work, the magneto-hydro-dynamic stability of pressure driven modes in the reversed field pinch has been analyzed. It is shown that at low and intermediate beta's, i.e., typically for values below 20-25%, the tearing parity is dominant, while only at very high beta, well above the achieved experimental values, at least part of the modes are converted to ideal interchange instabilities. Before their transition to ideal instabilities, according to their Lundquist number scaling, they can be classified as resistive-g modes.