Emerging requirements for extreme high power at high frequencies has generated further interest in fast wave interaction devices. These devices are characterized by circuit dimensions that are large compared to a wavelength which enhances both their high power and high frequency capabilities.This session deals with various types of fast wave devices. Papers are presented on both gyrotron oscillators and gyro-TWT amplifiers. Data on high power gyrotron show efficiencies approaching 50% in the lower millimeter frequency range (28-35 GHz). Gyro-TWT results are presented which reveal both high gain and high efficiency (>25%) performance.Other novel devices presented includeatheoretical analysisof acircuitlesselectron beam amplifier that has attractive features for wide band mm wave amplification. The theory of a competing fast wave device known as the Peniotron, which requires less magnetic field than a comparable gyrotron, is also presented. The final papers of this session discusses an electrostatic deflection modulation system for a high gain gyrocon amplifier. This system eliminates the bulky magnet presently required in existing gyrocon designs.
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