Abstract
The reasons for undertaking this research are outlined briefly, and a short description of the discharge apparatus is given. The determination of the properties of an underwater discharge plasma from measurements of the electrical energy input as a function of time, combined with simultaneous high—speed photographs of the expanding plasma on a microsecond time—scale is described. It is shown how a simple and extremely rugged shadowgraph system can be used to observe the propagation of the shock wave generated in the surrounding water by the action of the rapidly expanding plasma. Further useful and unexpected results obtained with this system, operating at sub—microsecond framing rates are described. It is demonstrated how some of the techniques evolved for these basic studies of shock wave and discharge properties can be used in development work aimed at producing intense ultra—violet light sources, and shock—wave generators for use in industrial processes, using the underwater discharge.
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