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Pulsewidth limitation in the relativistic backward wave oscillator
2000 / IEEE
This item was taken from the IEEE Periodical ' Pulsewidth limitation in the relativistic backward wave oscillator ' Spontaneous pulse shortening occurring in a relativistic backward wave oscillator (BWO) at gigawatt power levels is studied in experiment and theory. It is experimentally demonstrated that this phenomenon is accompanied by formation of an explosive-emission plasma at the surface of the corrugated slow-wave structure (SWS). Termination of microwave emission is explained by the increase of the BWO starting current from the absorption of the operating electromagnetic wave by electrons emitted from the plasma, whereas the intensity of the absorption radically increases offing to the presence of positive ions emitted from the plasma. Application of oil-free vacuum and electrochemical polishing of the SWS surface in an X-band BWO allowed generation of 3-GW, 26-ns microwave pulses with an energy of /spl sim/80 J, thereby demonstrating pulse lengthening by a factor of four.
Relativistic Backward Wave Oscillator
Spontaneous Pulse Shortening
Gigawatt Power Levels
Corrugated Slow-wave Structure
Space Vector Pulse Width Modulation
Electromagnetic Wave Absorption
Elementary Particle Vacuum
Relativistic Electron Beam Tubes
Backward Wave Oscillators
Slow Wave Structures
Engineered Materials, Dielectrics And Plasmas