Accession Number:

ADA159159

Title:

Nonlinear Analysis of a Relativistic Beam-Plasma Cyclotron Instability.

Descriptive Note:

Memorandum rept. Oct 84-Sep 85,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s):

Report Date:

1985-09-19

Pagination or Media Count:

35.0

Abstract:

A self-consistent set of nonlinear and relativistic wave-particle equations are derived for a magnetized beamplasma 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., speed of lightrelativistic 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 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. Keywords Cyclotron maser.

Subject Categories:

  • Particle Accelerators
  • Plasma Physics and Magnetohydrodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE