The extended Schottky cathode

Cathodes operating in the range of electric field strength and temperatures falling within the extended Schottky domain are discussed for applications requiring high current densities from a broad area cathode. Generally, these cathodes are operated in a pulsed high-voltage mode. Current densities of up to 300 A/cm/sup 2/ have been achieved without breakdown. Cathode performance is limited by space-charge effects and excessive evaporation at the high operating temperatures required.<
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