The design of a deflection cavity for a new microwave amplifier using transverse modulation

An experiment is being implemented to demonstrate a novel concept of microwave amplification that uses the transverse modulation of an electron beam instead of the conventional longitudinal modulation. A prototype experiment will use a 50-70-kV, 1-5-A, 4-μs electron beam at 1 Hz to amplify a 1300-MHz signal. The design considerations of a rectangular resonator to generate the deflection of an electron beam are presented here. Electromagnetic fields inside the cavity, along the beam line, impart transverse momentum to the electron beam through a deflection angle θ. Cavity height and width are selected so as to obtain a moderate Q value and appropriate filling time to optimize interaction between the electron beam and cavity deflecting fields. The required input power to the cavity is calculated for different deflection angles. Preliminary experimental results are given