Electromagnetic-wave excitation in a large laboratory beam-plasma system

Details Electromagnetic-wave excitation in a large laboratory beam-plasma system Electromagnetic-wave excitation in a large laboratory beam-plasma system

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981phrvl..47...95w&link_type=abstract

Physical Review Letters, vol. 47, July 13, 1981, p. 95-98.

Physics

Space Physics

56

Beam Injection, Beam Plasma Amplifiers, Plasma Radiation, Plasma-Electromagnetic Interaction, Wave Excitation, Beam Interactions, Electron Plasma, Electrostatic Probes, Magnetohydrodynamic Stability, Tokamak Devices

Scientific paper

The 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

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