Absorption of high frequency electromagnetic waves in a magnetoplasma
作者:
L. A. Ferrari,
A. W. McQuade,
R. J. LaHaye,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1977)
卷期:
Volume 20,
issue 10
页码: 1769-1776
ISSN:0031-9171
年代: 1977
DOI:10.1063/1.861778
出版商: AIP
数据来源: AIP
摘要:
Measurements of strong absorption of high frequency (&ohgr;≃&ohgr;c, &ohgr;/2&pgr;=2.45 GHz electromagnetic waves in a plasma (&ohgr;p2/&ohgr;2=2.7) are reported. The absorption is almost complete; the transmitted power is less than 0.1% and the reflected power is less than 5%. Coincident with the onset of strong absorption is the appearance of microwave energy in the plasma in two frequency bands, and an increase in the electron temperature (from 6 to 10 eV). One frequency band is close to the plasma frequency (&ohgr;p/2&pgr;≃4 GHz); the second is a low frequency band below 2 GHz. These modes are identified as being of the Gould–Trivelpiece type. Wave amplitude, combined with transmitted and reflected power measurements, suggest that 95% or more of the incident energy may be converted into the low frequency modes which are trapped in the plasma and thus can be dissipated via resistive absorption.
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