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Deutsch collection theory was developed for tubular geometry and applied to wire-plate ESP without taking into account the differences in geometry and current density distribution. Investigations revealed a square law relationship between the collector electric field and collector current density in space charge dominated coronas. Applying this relationship to Deutsch collection theory led to a new collection formula which is used to assess the impact on ESP performance due to the uneven current density distribution. A new concept of distributed corona impedance is developed to assess the...