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- W2070525358 abstract "The electron emitting capabilities of Spindt-type field emitting cathodes (FEC) are being studied at the Lewis Research Center, NASA. These cathodes, having 5000 emitting points in a 1 mm diameter, were developed by SRI International, under joint NASA and Navy sponsorship, and have been shown to be capable of emission current densities of 10 A/cm2 and higher. The purposes of this study are to (a) demonstrate that the cathodes can be processed and used in a tube-type configuration, (b) determine whether, at a sufficiently high current density, the cathode can operate in the space charge mode, and (c) evaluate failure mechanisms in this unique type of electron emitter. FEC's have been tested in a diode configuration, by the use of pulse techniques, up to current densities of 6 A/cm2 and anode potentials of 3000 V. Space charge effects have been observed in the range of 5 A/cm2 as an apparent linear increase of cathode current with anode voltage for a constant emitter-gate potential. Failed cathodes were studied by means of scanning electron microscopy and the major failure modes encountered are attributed to gas evolution, followed by arcing, which destroys either individual emitters or a large segment of the cathode area." @default.
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- W2070525358 date "1983-05-01" @default.
- W2070525358 modified "2023-10-01" @default.
- W2070525358 title "Evaluation of the emission capabilities of Spindt-type field emitting cathodes" @default.
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- W2070525358 doi "https://doi.org/10.1016/0378-5963(83)90074-0" @default.
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