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It has proved that the superior emission capability of a new type impregnated dispenser cathode through impregnates the BaO/SrO/Sc2O3 active substances and covers a mixture W+BaO/SrO/Sc2O3 coating by the pulse laser deposition. However, the thermionic emission of this impregnated dispenser cathode at low temperature is not clear. Our results illustrate that the Current-voltage characteristics of this...
A defect model for Sc2O3 was developed using quantum mechanical modeling and evaluated under cathode operating conditions to determine the electronic properties of Sc2O3 used in cathode experiments. We find that Sc2O3 can conduct well enough with a sub-ppm impurity concentration such that the limiting step of emission is not conduction through bulk Sc2O3.
Emission properties of nanosized scandia doped dispenser (SDD) cathodes tested at pulse mode with different pulse widths and duty cycles as well as at DC mode are reported and discussed in this paper.
Emission properties of Scandia Doped Dispenser (SDD) cathodes tested in Pierce Gun open structures have been reported in this paper. 80-100 A/cm2 Space-Charge Limited (SCL) current densities have been obtained at designed anode voltages and normal operating temperatures for cathodes with either flat surfaces or concave surfaces. The influences of anode effects on cathodes, which appear in close-spaced...
The technique for producing impregnated cathodes with a Re-W ldquospongerdquo matrix (75%-Re/25%-W mass ratio) and 3BaOmiddot0.5CaOmiddotAl2O3 as the emissive active substance has been developed. The emission properties of such cathodes with normal impregnation and of one with excess of emissive active substance have been studied. The cathodes with the normal impregnation have higher emission properties...
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