TRANSVERSE WAVE INTERACTION IN ELECTRON DEVICES

摘要

Experimental evidence has been accumulated regarding amplification at 600 MHz by mean of a thin electron beam and two Cocoa couplers (no pump structures). Gains up to 30 db were readily reproducible, but the RF power output was less than one milliwatts at a few per cent efficiency. Tuning by the dc magnetic field and by the beam voltage was demonstrated. The process seems to depend upon dc modes excited in the beam by its irregular injection into the magnetic field. Experiments with an oscillator based upon a hollow beam and a single Cocoa coupler are also included.