A survey of the results obtained in an experimental study of the pulsed properties of oxide cathodes is presented. Pulsed measurements reveal that unusually large electron currents are available in microsecond pulses, and that several other phenomena are modifications of the d.c. properties, namely (a) sparking and (b) pulse temperature rise. Sparking may be either current limited or voltage limited, depending upon cathode materials and life. The pulse temperature rise also depends upon materials and life and is indicative of the nature of the cathode resistance. Evidence for a layer structure of the oxide cathode can be drawn from pulsed data.
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Edward A. Coomes (1946) studied this question.
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