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ELECTRON SYNCHRONOUS WAVE AMPLIFIER,
UTAH UNIV SALT LAKE CITY MICROWAVE DEVICE AND PHYSICAL ELECTRONICS LAB
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The cyclotron-synchronous wave electron beam microwave amplifier is investigated. Coupling of the electron beam waves by the d-c space-charge forces and the spatially-varying d-c pump fields is examined, subject to the beam focusing conditions. The small signal assumption is made, and polarization variables are used to analyze the wave behavior in coupled-mode form for both the rotating and nonrotating electron beam cases. Force-free modes and transverse modes are obtained by solving the force equation. Nonlinear variation of the electrostatic pump field in the ring-type pump structure is considered. The gain of the cyclotron-synchronous coupling mechanism and the kinetic power density carried by the beam modes are not uniform across the beam cross section, as indicated in the filamentary beam analysis. The variations are significant only for a thick beam. Analysis shows that at omega omega sub c, the Cuccia cavity couples to the transverse modes strongly, but no coupling to the force-free waves is possible. Experimental results of the amplifier with Cuccia cavities as the coupling elements are included. Author
APPROVED FOR PUBLIC RELEASE