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In order to improve the mechanical strength and machining properties of Scandia Doped Dispenser (SDD) cathodes when they are applied into Vacuum Electron Devices (VEDs), an effort has been expended to increase the W grain sizes while maintaining the uniform doping of nanosized Scandia particle. By an improved liquid-solid (L-S) doping process, powders composed of W grains of about 1–2 micron in diameters...
The emission properties of nanosized scandia-doped dispenser cathodes tested in open-structure Pierce electron guns are reported in this paper. Over 100 A/cm2 and over 80 A/cm2 space-charge-limited current densities have been obtained at the operating temperatures of 950 °Cb and 1025°Cb for cathodes with planar emitting surfaces and cathodes with concave emitting surfaces, respectively, at rated anode...
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