Decay of Excess Charge in Dielectrics Having Shorted Electrodes

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Abstract
The flow equations are derived for the discharge of dielectrics having an arbitrary initial charge and shorted electrodes, for the case of rapid shallow trapping. The case of an initial charge distribution which is uniform down to a depth y is considered in detail. Nonisothermal conditions are readily handled. It is shown that only a small fraction f of the initial charge can be observed in the external circuit, and that a significant fraction g ≠ 1-f is retained in the specimen when the external current flow ceases. The calculation is applied to the ionic thermo-current observed in Mylar and is shown to accord well with the experimental measurements.

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