NDLI: Modern thermionic cathodes

Content Provider	IEEE Xplore Digital Library
Author	Green, M.
Copyright Year	1987
Description	Author affiliation: Varian Associates, Inc., Palo Alto, CA (Green, M.)
Abstract	This paper reviews the current state-of-the-art in modern thermionic dispenser cathodes. Over the past seven years there has been a resurgence of interest in extending the performance limits of thermionic cathodes, driven by the needs of advanced microwave tubes, in particular high-power millimeter-wave tubes and higher frequency longer life space communications tubes. More recently the development of high efficiency free electron lasers with the potential to transfer prodigious peak and mean powers to the radiation field has further increased the demands upon cathode performance in terms of current density and intrinsic brightness. The long-term benefits of the increase in R&D funding which has been directed toward the study of thermionic cathodes since the early 1980s are now becoming apparent. The development of advanced dispenser cathodes is no longer based upon empirical experimentation but is guided by engineering and understanding based upon our increased knowledge of cathode physics. Advanced mixed-metal-matrix cathodes have shown lives of over 30,000 hours at 8 $A/cm^{2}.$ Fully space charge limited emission capability of 100 $A/cm^{2}has$ been demonstrated and design lifetimes of 100,000 hours at 6-10 $A/cm^{2}are$ now a practical possibility.
Starting Page	925
Ending Page	928
File Size	16589
Page Count	4
File Format	PDF
DOI	10.1109/IEDM.1987.191522
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1987-12-06
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Cathodes Electron tubes Frequency Microwave communication Free electron lasers Power lasers Masers Current density Brightness Knowledge engineering
Content Type	Text
Resource Type	Article

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