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A simple theory of the trapping of gas in a `fast-pinch' gas discharge is given. In the early stages of a gas discharge, a sheet of current flows near the walls of the discharge tube. This sheet subsequently collapses on to the cold gas inside it, with the consequent compression of the gas. It is shown that the efficiency of the trapping of the cold gas within the sheet during the collapse stage increases with the initial gas density.
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N.J. Phillips (1959) studied this question.
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