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18 - Emission and Breakdown Phenomena

Published online by Cambridge University Press:  27 April 2018

Richard G. Carter
Richard G. Carter
Affiliation:
Lancaster University
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Summary

Fast-wave devices employ interactions between modes of propagation in a smooth waveguide whose phase velocity is greater than the velocity of light and electron beams which are periodic so that synchronous interaction is possible. The most important type of tube is the gyrotron (electron cyclotron maser) in which the electrons moving in orbits under the influence of a longitudinal magnetic field interact with a transverse electric (TE) waveguide mode. The small-signal theory of gyrotrons reveals the synchronous conditions for the gyrotron oscillator, the gyro-klystron, -TWT and -BWO and the cyclotron auto-resonance maser (CARM). A simple non-linear model is described which can reproduce the main features of the performance of a gyrotron oscillator. The principles of the design of gyrotron oscillators and amplifiers are reviewed. There is a brief discussion of the principles of operation of the peniotron and the ubitron (free electron laser).
Type
Chapter
Information
Microwave and RF Vacuum Electronic Power Sources , pp. 694 - 734
Publisher: Cambridge University Press
Print publication year: 2018

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