Accession Number:

AD0681121

Title:

AN EXPERIMENTAL AND THEORETICAL STUDY OF WAVE MIXING IN A BOUNDED MAGNETOPLASMA,

Descriptive Note:

Corporate Author:

COLUMBIA UNIV NEW YORK PLASMA LAB

Personal Author(s):

Report Date:

1968-08-01

Pagination or Media Count:

122.0

Abstract:

Generation of space-charge waves at UHF frequencies by the nonlinear interaction of two microwave signals in a magnetoplasma is described. The experiment was performed using a neon after-glow p .02 torr, which formed a post in a square x-band waveguide. The results of the experiment agree quantitatively with a calculation of the interaction which accounts for its finite geometry. The nonlinear coupling is found to result from a Lorentz force interaction between the electron velocity induced by one incident wave and the time varying magnetic field of the other. A similar calculation and experiment were performed in which one microwave was scattered from a driven space-charge wave. It is shown that the results of the two first order interactions can be combined to give a realistic prediction of second order processes such as optical mixing, and parametric excitation. The nonlinear calculation used to describe these experiments is a special case of a general coupling principle developed here for calculating nonlinear wave interactions in finite anisotropic plasmas. As another example, the coupling principle is utilized to derive coupled-mode equations for a nonlinear magnetoplasma waveguide. Author

Subject Categories:

  • Plasma Physics and Magnetohydrodynamics
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE