Results of an experimental study of the pressure field of a shock acoustic wave in a closed chamber with condensed matter are presented; this wave results from the electric explosion of a plane ring foil, on which discharge current passes in the radial direction. The presence of a pronounced pressure maximum with regard to the electrode-system axis can be interpreted as the effect of nonlinear interaction of elements of the shock acoustic waves excited on diametrically opposite sides of the exploding ring foil.
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