On the representation of dense plasma focus as a circuit element

The dense plasma focus is a discharge powered by capacitor bank. Standard diagnostics include the measurement of time derivative current through and voltage across its connections with Interpretation this diagnostic data often involves some assumptions regarding representation as varying inductance. One characteristic features waveform relatively sharp dip an associated spike. This has been interpreted result rapid rise in inductance plasma. Sometimes, anomalous impedance invoked. Letter discusses instances where such interpretation creates conceptual difficulties. A first principles approach to circuit element reveals fundamental problems traditional shown be necessary account for difference motional implied time-varying description based on Poynting's theorem. Dynamo effects that convert post-stagnation local motion into three-dimensional magnetic fields are contribute effective resolve observed