Microwave Scattering from Plasma Waves
作者:
C. B. Wharton,
J. H. Malmberg,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1968)
卷期:
Volume 11,
issue 12
页码: 2655-2664
ISSN:0031-9171
年代: 1968
DOI:10.1063/1.1691872
出版商: AIP
数据来源: AIP
摘要:
Experimental studies of the scattering of electromagnetic waves (34 GHz) from longitudinal plasma waves (250‐500 MHz) are described. The plasma waves propagate in a 230‐cm‐long collisionless plasma column, having an electron density on axis ofne0 = 2.7 × 109cm−3and an electron temperatureTe≈ 13 eV. Scattering was observed both from plasma waves launched by a probe antenna and from waves grown up to a nonlinear saturation out of the white noise background by resonant interaction with an electron beam. The properties of these waves are accurately determined by auxiliary measurement. By using movable antennas we are able to measure the spatial growth and damping coefficients of plasma waves and to measure their absolute amplitudes. The microwave scattering is observed at a frequency displaced from the microwave frequency by the plasma wave frequency, and at an angle related to the Bragg angle. The measured frequency spectrum, angular dependence, and scattering amplitudes are compared with the theory and with rf probe measurements, giving excellent agreement in all cases.
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