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A high-current-density scandate tungsten dispenser cathode was used for the demonstration of a 25 : 1-aspect-ratio 750- -current-density sheet beam for the Defence Advanced Research Project Agency High-Frequency Integrated Vacuum Electronics (HiFIVE) program intended for the realization of a wideband (30%) 220-GHz traveling wave tube. The elliptical cathode with homogeneous microstructure...
Sc2O3-doped W powder for use in high current density thermionic cathodes has been made by the sol-gel method with different particle sizes. Sc2O3-W matrix cathodes have been prepared from these powders, and have shown excellent emission properties. A space charge limited current density of 40 A/cm2 at 850°C, and 170 A/cm2 at 1050°C have been obtained by using 300-500 nm Sc2O3-doped (5.0 wt.%) W powders...
Vertically aligned copper indium diselenide nanorod arrays were synthesized by electrodeposition using porous anodic alumina template supported on a tungsten/silicon substrate. Porous anodic alumina template was fabricated by anodizing aluminium film which was sputtered onto tungsten/silicon substrate. The approach employed a selective chemical etching to penetrate the barrier layer at the bottom...
Nano Sc2O3-doped W powder for use in high current density thermionic cathodes has been made by the sol-gel method with different average particle size: around 72 nm, 146 nm, 272 nm, and 587 nm, respectively. By using these powders, Sc2O3-doped tungsten matrices with the nanosize tungsten grains were obtained as discussed in this paper. Sc2O3-doped W matrix impregnated cathodes have shown excellent...
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