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Electro-Mechanical Modes in Plasma Waveguides

Gould, R. W. and Trivelpiece, A. W. (1958) Electro-Mechanical Modes in Plasma Waveguides. Proceedings of the IEE - Part B: Radio and Electronic Engineering, 105 (10). pp. 516-519. ISSN 0534-2791.

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In addition to increasing the cut-off frequencies of TM-modes in a waveguide, the introduction of a plasma column into the waveguide also introduces new modes of propagation. The properties of these modes, including the effect of an axial d.c. magnetic field but neglecting ion motion, have been studied by solving the field equations considering the electron plasma as a dielectric. The new modes generally have phase velocities much less than the velocity of light; one type exists down to zero frequency and another type is a backward wave. Neither the metallic conductor nor the axial magnetic field is essential to the existence of slow modes. Angular-dependent modes can exhibit Faraday rotation of polarization. A qualitative explanation of these modes is given in terms of an equivalent electrical circuit for the transmission line. Many of the properties of these modes have been verified experimentally by measuring phase velocity of waves along a mercury-arc discharge in an axial magnetic field. These modes are closely related to space- charge waves in electron beams, and several interesting microwave applications arc suggested.

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Additional Information:© 1958 IEE. {The paper was first received 19th February, and in revised form 11th April, 1958. It was presented at the International Convention on Microwave Valves, 20th May, 1958.) The research described herein was conducted under Contract Nonr-220(13) with the United States Navy, Office of Naval Research, and all rights granted to the U.S. Government under that contract are hereby reserved.
Group:Electron Tube and Microwave Laboratory
Funding AgencyGrant Number
Office of Naval Research (ONR)220(13)
Subject Keywords:Equivalent circuits; plasma; waveguides
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Other Numbering System NameOther Numbering System ID
Electron Tube and Microwave Laboratory Technical Report9
Series Name:Electron Tube and Microwave Laboratory Technical Report
Issue or Number:10
Record Number:CaltechAUTHORS:20190222-150415098
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:93188
Deposited By: Melissa Ray
Deposited On:25 Feb 2019 19:05
Last Modified:03 Oct 2019 20:51

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