The plasma contained in a "Spherator" system with a pure poloidal magnetic field and a surrounding gas blanket can be made absolutely stable against magnetohydrodynamic perturbations in the low-β limit. This situation can even be achieved for a sufficiently high ratio between the pressures in the thermonuclear region and the cold boundary region to satisfy reactor conditions, provided that the outer plasma boundary is chosen close to a separatrix.
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T. Hellsten (1976) studied this question.
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