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At present carbon nanotubes (CNT) are the most prospective cathode material for triode applications because of their strong field emission (FE) at low electric fields. The FE homogeneity of flat CNT cathodes, however, is still limited by their rather fast and uncontrolled growth which usually leads to strongly varying field enhancement and current carrying capability of the individual emitters. Therefore,...
We report the experimental study of field emission from cold cathodes having a raised ridge or knife-edge structure and analyses using a Transfer Matrix Method (TMM) model used to extract the cathode parameters. Local emission current measurements were done on a copper cathode, which was fabricated using electric discharge machining (EDM) and chemical etching yielding ridges of thickness 15 mum. Measurements...
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