NDLI: Electromagnetic properties of periodic cavities coupled to a radiating antenna

Content Provider	IEEE Xplore Digital Library
Author	Kobayashi, S. Botton, M. Carmel, Y. Antonsen, T.M. Rodgers, J. Shkvarunets, A.G. Vlasov, A.N. Duan, L. Granatstein, V.L.
Copyright Year	1973
Abstract	The electromagnetic properties of spatially periodic cavities determines both the linear and nonlinear interaction between the waves and the electron beam in high-power backward-wave oscillators. A corrugated cavity is usually left open at one end for extraction of the useful microwave energy; however, reflections at the open end are large so that a cavity is still formed. In contrast to a previously studied N period closed cavity where the number of axial modes with frequencies falling in the lowest pass band of the structure is equal to N+1, an open cavity was found to support only N axial modes. In this paper the resonance frequencies, quality factors and the field patterns of the axial modes in an open cavity were all investigated experimentally and the results are in very good agreement with those obtained using a new, time-dependent, quasi-three dimensional code. It was also demonstrated that a short interface section between the periodic cavity and the radiating antenna can drastically reduce the quality factors to the diffraction limit over a very wide frequency band. This is expected to substantially increase the starting current and allow operation at high-beam current without degradation of spectral purity.
Sponsorship	IEEE Nuclear and Plasma Sciences Society
Starting Page	947
Ending Page	954
Page Count	8
File Size	210570
File Format	PDF
ISSN	00933813
Volume Number	26
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1998-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electromagnetic coupling Q factor Electromagnetic scattering Electron beams Microwave oscillators Optical reflection Electromagnetic reflection Resonance Resonant frequency Diffraction
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Condensed Matter Physics

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