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Microwave Scattering and Noise Emission from Afterglow Plasmas in a Magnetic Field

Blum, F. A. and Bauer, L. O. and Gould, R. W. and Stenzel, R. L. (1969) Microwave Scattering and Noise Emission from Afterglow Plasmas in a Magnetic Field. Physics of Fluids, 12 (5). pp. 1018-1027. ISSN 1070-6631. doi:10.1063/1.2163662.

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The microwave reflection and noise emission (extraordinary mode) from cylindrical rare‐gas (He, Ne, Ar) afterglow plasmas in an axial magnetic field is described. Reflection and noise emission are measured as a function of magnetic field near electron cyclotron resonance (ω ≈ ω_c) with electron density as a parameter (ω_p < ω). A broad peak, which shifts to lower values of ω_c/ω) as electron density increases, is observed for (ω_c/ω) ≤ 1. For all values of electron density a second sharp peak is found very close to cyclotron resonance in reflection measurements. This peak does not occur in the emission data. Calculations of reflection and emission using a theoretical model consisting of a one‐dimensional, cold plasma slab with nonuniform electron density yield results in qualitative agreement with the observations. Both the experimental and theoretical results suggest that the broad, density‐dependent peak involves resonance effects at the upper hybrid frequency ((ω_h)^2 = (ω_c)^2 + (ω_p)^2) of the plasma.

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Additional Information:© 1969 The American Institute of Physics. Received 15 November 1968. We are indebted to R. S. Harp for comments and suggestions during the course of this research. This work was supported by the United States Office of Naval Research under Contract Nonr 220(50). One of the authors (F.A.B) received support as a Howard Hughes Predoctoral Fellow and another of the authors (L.O.B.) received partial support from the Swiss Council of Scientific Research.
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Office of Naval Research (ONR)Nonr-220(50)
Howard Hughes Medical Institute (HHMI)UNSPECIFIED
Swiss Council of Scientific ResearchUNSPECIFIED
Issue or Number:5
Record Number:CaltechAUTHORS:20120827-144355658
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Official Citation:Microwave Scattering and Noise Emission from Afterglow Plasmas in a Magnetic Field F. A. Blum, L. O. Bauer, R. W. Gould, and R. L. Stenzel, Phys. Fluids 12, 1018 (1969), DOI:10.1063/1.2163662
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33575
Deposited On:27 Aug 2012 22:08
Last Modified:09 Nov 2021 21:35

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