Wave dispersion, growth rates, and mode converter analysis for a sheet beam, hybrid-mode Cerenkov amplifier

Author

Chang, Sheng-Fuh R. ; Scharer, John E. ; Booske, John H.

Author_Institution

Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA

Volume

20

Issue

3

fYear

1992

fDate

6/1/1992 12:00:00 AM

Firstpage

293

Lastpage

304

Abstract

The hybrid-mode dispersion relation and resonant growth rates are solved for a finite-thickness sheet electron beam propagating through a rectangular guide with a thin dielectric slab. Analytic results for the growth rates, bandwidth and mode competition for an infinite magnetic field in the limit of a dilute beam are then presented. To properly couple to the desired EH₁₀ hybrid amplifier slow wave mode, the coupled waveguide mode equations are solved for a dielectric taper to accomplish the TE₁₀ to EH₁₀ mode transition. A piecewide linear taper which suppresses the competing EH₁₁ mode and other hybrid modes is developed and the overall amplifier system is discussed

Keywords

Cherenkov radiation; dielectric-loaded waveguides; dispersion relations; electron beams; masers; waveguide couplers; EH₁₀ hybrid amplifier; bandwidth; coupled waveguide mode equations; dielectric taper; dispersion relation; hybrid-mode Cerenkov amplifier; infinite magnetic field; mode competition; mode converter analysis; mode suppression; piecewide linear taper; rectangular guide; resonant growth rates; sheet electron beam; slow wave mode; thin dielectric slab; wave dispersion; Bandwidth; Dielectrics; Dispersion; Electron beams; Magnetic analysis; Magnetic fields; Magnetic resonance; Slabs; Tellurium; Waveguide transitions;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.142831

Filename

142831