INVESTIGATION OF VARIOUS ACTIVATOR REFRACTORY SUBSTRATE COMBINATIONS
GENERAL ELECTRIC CO SCHENECTADY NY
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The investigation was a study of various thin film refractory substrate combinations capable of producing high current density in dispenser type cathodes. Work function was used as the fundamental property common to all systems in evaluating the emission properties of the various dispenser cathode systems fabricated and evaluated during this program. The cathode systems were evaluated in a beam tester at both dc and pulsed operation and a barium- strontium-tungstate cathode produced dc emission in excess of 30 amperes per sq cm for a period of nine hours in a saturated emission condition. It is generally concluded that the dispenser cathode is capable of high current densities for use in devices where 1 to 2 amperes per sq cm is a requirement and dc or long duty cycle operation is desirable.
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