Abstract

Single m = 0 instability modes have been excited in the normally stable initial stage of an argon Z-pinch discharge by means of a set of equally spaced glass rings. High-speed framing camera photographs show that the instabilities develop approximately in accordance with the Rayleigh-Taylor theory. No axial drift of the instabilities is observed but the new technique of studying instabilities reveals that the acceleration of the discharge boundary changes appreciably three or four times during the course of the first stage of the discharge.

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