Measurements on Wave Propagation Characteristics of Spiraling Electron Beams

Dispersion characteristics of cyclotron-harmonic waves propagating on a neutralized spiraling electron beam immersed in a uniform axial magnetic field are studied experimentally. The experimental setup consisted of a vacuum system, an electron-gun corkscrew assembly which produces a 110-eV beam with...

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Bibliographic Details
Published in:IEEE transactions on plasma science 1976-12, Vol.4 (4), p.287-291
Main Authors: Singh, Ajit, Getty, Ward D.
Format: Article
Language:English
Subjects:
Dispersion
Distribution functions
Electron beams
Frequency
Magnetic field measurement
Magnetic fields
Physics
Plasma properties
Plasma stability
Plasma waves
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Summary:Dispersion characteristics of cyclotron-harmonic waves propagating on a neutralized spiraling electron beam immersed in a uniform axial magnetic field are studied experimentally. The experimental setup consisted of a vacuum system, an electron-gun corkscrew assembly which produces a 110-eV beam with the desired delta-function velocity distribution, a measurement region where a microwave signal is injected onto the beam to measure wavelengths, and a velocity analyzer for measuring the axial electron velocity. Results of wavelength measurements made at beam currents of 0.15, 1.0, and 2.0 mA are compared with calculated values, and undesirable effects produced by increasing the beam current are discussed. It is concluded that a suitable electron beam for studies of cyclotron-harmonic waves can be generated by the corkscrew device.
ISSN:0093-3813
1939-9375
DOI:10.1109/TPS.1976.4316982