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DIII-D discharges with values of beta (the ratio of plasma pressure to magnetic pressure) up to 12. 5% demonstrate that a resistive wall can stabilize low- n magnetohydrodynamic (MHD) modes. In discharges with broad current profiles, beta exceeds the ideal MHD stability limit by at least a factor of 1. 3 assuming no wall, but remains below the limit calculated under the assumptions that the vacuum vessel is a perfectly conducting wall. Plasma rotation is essential to stabilization, and instabilities resembling the predicted ``resistive wall mode'' appear only when the rotation velocity approaches zero.
Strait et al. (1995) studied this question.