Electrostatic electron beam couplers

Electrostatic electron beam couplers can be used in conjunction with a parametric amplifier to produce low-noise electron beam amplification. The characteristics and design of both traveling-wave and resonant couplers are considered. The latter are broader-band and shorter than the traveling-wave version; however, the traveling-wave coupler does not require critical load adjustment and is electrically tunable. An important advantage of the electrostatic fast-wave coupler over the magnetic version considered by Cuccia is the elimination of the magnetic field.