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

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3 Author(s)
Chang, S.-F.R. ; Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA ; Scharer, J.E. ; Booske, J.H.

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

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Plasma Science, IEEE Transactions on  (Volume:20 ,  Issue: 3 )