Accession Number : ADA195339

Title :   Research on a Two-Stage Free Electron Laser Oscillator.

Descriptive Note : Final rept. 10 Dec 84-9 Dec 85.

Corporate Author : BERKELEY RESEARCH ASSOCIATES INC CA

PDF Url : ADA195339

Report Date : Mar 1988

Pagination or Media Count : 91

Abstract : The research involved the theoretical and numerical analysis of the physics of free electron lasers using relativistic particle beams. The major emphasis of the research was to obtain design criteria for the development of a two-stage FEL oscillator operating in the trapped particle mode. The present work was centered on the development of a fully relativistic, nonlinear analysis of the spatial and temporal evolution of multiple modes within a free electron laser oscillator and of a large amplitude, nonlinearly saturated state characteristic of trapped particle mode operation. The equations solved are the Maxwell equations of electrodynamics coupled with the collisionless Boltzmann equation that describes collisionless particles under influence of the electromagnetic fields. The electromagnetic fields include the radiation fields from the FEL and the self-electric fields from the longitudinal potential due to the space charge, i.e., the dominant component of the interparticle Coulomb forces. The particle dynamics transverse to the magnetic axis are included, but gradients in the radiation fields are ignored. The electron beam equilibrium is assumed to be spatially uniform and temporally stationary. Justification and probable impact of further approximations are discussed in the technical section of this report. The approximations employed are consistent with the purpose of obtaining experimentally implementable design criteria for the FEL oscillator.

Descriptors :   *FREE ELECTRON LASERS, *OSCILLATORS, AMPLITUDE, DYNAMICS, ELECTRODYNAMICS, ELECTROMAGNETIC FIELDS, ELECTRON BEAMS, EQUILIBRIUM(GENERAL), IMPACT, MAGNETIC FIELDS, MAXWELLS EQUATIONS, NONLINEAR ANALYSIS, NUMERICAL ANALYSIS, PARTICLE BEAMS, PARTICLES, PHYSICS, PROBABILITY, SATURATION, SPACE CHARGE, THERMAL RADIATION, TRAPPING(CHARGED PARTICLES), RELATIVITY THEORY

Subject Categories : Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE