Fast Jets from Collapsing Cylinders

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Abstract
A method is described for producing fast jets from the collapse of metal‐lined cavities in high explosives. The behavior of these jets suggests that they cannot be accounted for by the simple hydrodynamical considerations that have in the past been successful when applied to slower type jets. Various experiments, including time‐resolved spectrographic observations, show the jets to be, at least in part, of a gaseous nature. Velocities as high as 90 km/sec have been observed for beryllium jets, with heavier elements exhibiting lower velocities in inverse order of their atomic weights.

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