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1963 The paper amplifier amplitude antenna assumed Author's abstract automaton average backward wave BACKWARD WAVE OSCILLATOR basis capacitance carbonyl iron channel circuit coefficient communication systems component computer section condition cone constant core corresponding denotes derived determined device dimensionless directivity pattern dispersive medium electric field electrolyte electrolyte surface electron concentration electron-hole equation equilibrium Excerpts expression flux density formula frequency modulation function half-cycle harmonic mode high injection level hysteresis integral curve inversion klystron lateral surface linear Luneberg lens magnetic amplifiers magnitude method mode multichannel message nonlinear number of particles obtain operating optical optimal oscillator output p-n junction p-region parameters phase plane plane lens possible problems propagated pulsations pulse quantity radiating aperture Radiotekhnika i Elektronika rectangular refractive index region relationship semiconductor signal singular point slow-wave system solution solve space charge specified system of probes trajectories transient responses transit angle variation velocity volt-ampere characteristic voltage drop waveguide