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This paper introduces the investigation of high performance Nickel-Oxide cathode for high powerw with long pulse. The authors also discuss the key factors affecting the performance of cathode, including the cathode surface, porosity of Nickel matrix, and distribution of temperature, etc. the authors employ the special mould to change the density and roughness of cathode surface. Finally, the magnetron...
Both kinds of 10 cm diameter thermionic dispenser cathode have been fabricated at BVERI. One is impregnated scandate (I-Sc) cathode and the other is traditional Ir-coated “M” cathode with 411 impregnant. Figure 1 is the photograph of Φ10 cm cathode assembly. The scandate cathode can deliver the same density as “M” cathode but 80-100°C lower in temperature, though it needs higher vacuum than “M” cathode...
The development of high current-density cathodes employing scandia-doped tungsten powders is reviewed in this paper. A matrix with a submicrometer microstructure characterized by uniformly distributed nanometer particles of scandia is believed to play a dominant role in the improved emission capability of these cathodes. Space-charge-limited current densities of over 30 A/cm2 at 850 degCb have been...
We measured SDDCs emission property and made comparison with impregnated scandate (I-Sc). A reasonable explanation on abnormal Schottky effect of SDDCs is given. The authors proposed a "semiconductor-monolayer superposition" model to explain emission mechanism of all kinds of thermionic cathodes, including oxide cathodes, M-type cathodes and scandate cathodes. Finally, from the view of engineering...
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