Physics – General Physics
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phrva..33.1261s&link_type=abstract
Physical Review A - General Physics, 3rd Series (ISSN 0556-2791), vol. 33, Feb. 1986, p. 1261-1269. Navy-supported research.
Physics
General Physics
8
Beam Interactions, Cyclotron Radiation, Magnetohydrodynamic Stability, Plasma-Electromagnetic Interaction, Relativistic Electron Beams, Wave Interaction, Energy Conversion Efficiency, Nonlinear Equations, Particle Interactions, Propagation Velocity
Scientific paper
A self-consistent set of nonlinear and relativistic wave-particle equations are derived for a magnetized beam-plasma system interacting with electromagnetic cyclotron waves. In particular, the high-frequency cyclotron mode interacting with a streaming and gyrating electron beam within a background plasma is considered in some detail. This interaction mode may possibly find application as a high-power source of coherent short-wavelength radiation for laboratory devices. The background plasma, although passive, plays a central role in this mechanism by modifying the dielectric properties in which the magnetized electron beam propagates. For a particular choice of the transverse beam velocity (i.e., the speed of light divided by the relativistic mass factor), the interaction frequency equals the nonrelativistic electron cyclotron frequency times the relativistic mass factor. For this choice of transverse beam velocity the detrimental effects of a longitudinal beam velocity spread is virtually removed. Power conversion efficiencies in excess of 18 percent are both analytically calculated and obtained through numerical simulations of the wave-particle equations. The quality of the electron beam, degree of energy and pitch angle spread, and its effect on the beam-plasma cyclotron instability is studied.
Sprangle Phillip
Vlahos Loukas
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