High-brightness, long life thermionic cathode and methods of its fabrication
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United States of America Patent
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Oct 20, 2015
Grant Date -
Apr 10, 2014
app pub date -
Oct 4, 2012
filing date -
Oct 4, 2012
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Abstract
An improved cathode comprises a cone-shaped emitter with a carbon-based coating applied to the emitter cone surface, in which there is a narrow annular gap between the emitter body and the carbon coating. The gap prevents direct contact between the carbon coating and the crystalline emitting material, thereby preventing damaging interactions and extending the useful lifetime of the cathode.
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