Abstract
It is demonstrated that tearing-mode-stable diffuse-pinch configurations of the reverse-field pinch type exist at zero β for a current-carrying column surrounded by a small vacuum region. The conducting wall plays a vital role in this stability both to m = 0 and m = 1 modes. The core of the plasma, which has to satisfy a resistive-stability criterion, is of the form given by Taylor for a minimum-energy state but the outer region is quite different. Values of the pinch configuration parameter θ up to 3 are possible, permitting strong Ohmic heating with zero or low current densities near the wall. Such configurations can be stable to ideal hydro magnetic modes for central values of β of up to 17% (average β 35%).
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