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An isolated column of plasma is formed by the partial ionization of neutral argon gas with an intense, high-energy photon beam. The manner in which this plasma expands radially from its initial prescribed position is observed in a region where the plasma has no interaction with confining walls. It is shown that the expansion proceeds initially in accord with the wave equation, having a velocity of propagation u ≈ (γkTe/Mi)1/2, a value predicted theoretically by Shimony and Cahn. The driving force for the plasma expansion comes from the electrons, which are in turn cooled predominately by the adiabatic expansion.
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Julius Hyman (1968) studied this question.
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