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Electromagnetic-wave excitation in a large laboratory beam-plasma systemThe mechanism by which unstable electrostatic waves of a beam-plasma system are converted into observed electromagnetic waves is of current interest in space physics and in tokamak fusion research. The process involved in the conversion of electrostatic to electromagnetic waves at the critical layer is well understood. However, the radiation from uniform plasmas cannot be explained on the basis of this process. In connection with certain difficulties, it has not yet been possible to establish the involved emission processes by means of experimental observations. In the considered investigation these difficulties are overcome by employing a large laboratory plasma in a parameter range suitable for detailed diagnostics. A finite-diameter electron beam is injected into a uniform quiescent afterglow plasma of dimensions large compared with electromagnetic wavelengths. The considered generation mechanism concerning the electromagnetic waves is conclusively confirmed by observing the temporal evolution of an instability
Document ID
19810056874
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Whelan, D. A.
(California Univ. Los Angeles, CA, United States)
Stenzel, R. L.
(California, University Los Angeles, CA, United States)
Date Acquired
August 11, 2013
Publication Date
July 13, 1981
Publication Information
Publication: Physical Review Letters
Volume: 47
Subject Category
Plasma Physics
Accession Number
81A41278
Funding Number(s)
CONTRACT_GRANT: NSG-7616
CONTRACT_GRANT: NAGW-180
Distribution Limits
Public
Copyright
Other

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