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Space Charge Effects in Beam‐Type Magnetrons

Gould, Roy W. (1957) Space Charge Effects in Beam‐Type Magnetrons. Journal of Applied Physics, 28 (5). pp. 599-605. ISSN 0021-8979.

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A theoretical treatment of space charge effects in beam‐type magnetron amplifiers and oscillators is given. It is assumed that the beam is relatively thin and that the magnetic field is large. The "cyclotron waves" are not treated. A space charge parameter appears in this theory of magnetron‐type traveling‐wave interaction in a manner which is analogous to the manner in which QC appears in ordinary traveling‐wave interaction. A distinctive feature of the space charge waves in the magnetron case is that one increases along the beam and the other decreases along the beam. A simple physical explanation of this effect is given. This theory is then used to determine the starting conditions of an M‐type backward wave oscillator. It is found that when the tube is long in space charge wavelengths there is an appreciable reduction of starting current. When the space charge parameter approaches zero, the solutions found here reduce to the usual two‐wave solutions.

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Additional Information:The author wishes to express his appreciation for the helpful discussions with his associates, Professor Lester M. Field and James W. Sedin. Dr. J. Warga and D. Rubin of the mathematics department of the Electrodata Corporation and Iwao Sugai contributed the numerical solutions presented here. This work was carried out as part of a program of research in the field of microwave electronics which is supported by the Office of Naval Research. It is a pleasure to acknowledge this general support as well as a grant from the Sperry Gyroscope Company which made possible the computational results described in Sec. V.
Group:Electron Tube and Microwave Laboratory
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Office of Naval Research (ONR)UNSPECIFIED
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Electron Tube and Microwave Laboratory Technical Report5
Series Name:Electron Tube and Microwave Laboratory Technical Report
Issue or Number:5
Record Number:CaltechAUTHORS:20190215-170644832
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92964
Deposited By: Melissa Ray
Deposited On:19 Feb 2019 22:55
Last Modified:03 Oct 2019 20:50

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