Abstract
We tested the effects produced by a converging shock wave propagating through a plasma. Experimental data gave the first indications on the interaction of a weak converging front with a fairly inhomogeneous, intermediate-density (∼1018 cm−3) plasma at a temperature of few eV. It is found that most of the energy of the converging shock wave is devoted to the ionization of the cold external layers of the plasma. In hydrogen the residual shock energy produced a stop in natural adiabatic cooling, while in helium the lower temperature and the higher ionization energies avoided any appreciable temperature effect.
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