Abstract
Toroidal z-pinches were initiated in a slowly varying positive field, and a negative field was superimposed. The effect of the outer field was found to be largely independent of the field delay provided that the base discharge reaches a conductivity that is large enough so that the two fields become separated from each other. Then the internal field enhancement becomes larger, the plasma is better confined, and the electron temperature rises, but only for a limited time. When the negative field replaces the positive one at the plasma boundaries, a rapid change develops. The field passes from its positive value to a negative value of the same amplitude in a few mu sec. (C.E.S.)
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