High current density Sc2O3-W matrix dispenser cathode |
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Authors: | WANG JinShu ZHANG XiZhu LIU Wei WANG YiMan ZHOU MeiLing&ZUO TieYong |
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Affiliation: | School of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China |
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Abstract: | Sc2O3-W matrix dispenser cathodes have been prepared by powder metallurgy method and tested in Pierce electron guns.The emission current density can reach 72 A/cm2 at 900C and over 100 A/cm2 can be achieved at a temperature higher than 950C.The emission improves and then keeps stable with time throughout the life testing period of 330 h at a continuous loading of 88 A/cm2pulsed current density with a pulse width of 10μs and duty cycle of 0.2%.The cathode surface is covered by a semiconductor multilayer composed of Ba,Sc and O.The emission behavior of the cathode can be explained by a semiconductor model. |
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Keywords: | emission property Scandia doped tungsten cathode |
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