The total current I total waveform in a plasma focus discharge is the most commonly measured quantity, contrasting with the difficult measurement of I pinch . However, yield laws should be scaled to focus pinch current I pinch rather than the peak I total . This paper describes how I pinch may be computed from the I total trace by fitting a computed current trace to the measured current trace using the Lee model. The method is applied to an experiment in which both the I total trace and the

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... ma sheath current trace were measured. The result shows good agreement between the values of computed and measured I pinch .