NDLI: Emission Behavior of Three Conditioned Carbon Fiber Cathode Types in UHV-Sealed Tubes at 200 A/<inline-formula> <tex-math notation=LaTeX>$mathrm{cm}^{2}$ </tex-math></inline-formula>

Content Provider	IEEE Xplore Digital Library
Author	Parson, J.M. Lynn, C.F. Mankowski, J.J. Neuber, A.A. Dickens, J.C.
Copyright Year	1973
Abstract	When subjected to high electric fields in vacuum, carbon fiber cathodes produce intense electron beams suitable for high-power microwave (HPM) generation at very high current densities. However, the production mechanisms of these intense electron beams are not fully understood. This paper presents the postmortem examination of three conditioned carbon fiber cathode types. The three cathode types consist of an uncoated, bare unimodal fiber structure, a bare bimodal fiber structure, and a cesium-iodide (CsI)-coated bimodal fiber structure, all with identical fiber coverage of 2% by area. Each cathode was conditioned prior to testing by single pulse operation driven by an 80 J Marx generator for 10 000 pulses. HPM, voltage, and current waveforms of each cathode are presented. The bare bimodal cathode radiated more microwave power than the CsI-coated cathode and bare unimodal cathode. Scanning electron microscopy imagery presents evidence of two emission mechanisms: 1) explosive electron emission and 2) surface flashover, which both were found on the CsI-coated cathode. In addition, no evidence of surface flashover was found on either uncoated cathode.
Sponsorship	IEEE Nuclear and Plasma Sciences Society
Starting Page	3982
Ending Page	3988
Page Count	7
File Size	9804079
File Format	PDF
ISSN	00933813
Volume Number	42
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Cathodes Carbon dioxide Electron beams Microwave imaging Microwave oscillators Shafts vircator. Carbon fiber cathodes electron beam electron emission electron sources high-power microwave (HPW) generation vircator
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Condensed Matter Physics

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Conditioning of Carbon Fiber Cathodes in UHV-Sealed Tubes at 200 A/cm²

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Emission Behavior of Three Conditioned Carbon Fiber Cathode Types in UHV-Sealed Tubes at 200 A/ $mathrm{cm}^{2}$

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