Title :
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
fDate :
6/1/1992 12:00:00 AM
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;
Journal_Title :
Plasma Science, IEEE Transactions on
