Simulation of a prebunched free-electron laser with planar wiggler and ion channel guiding

Journal Article · Mon Feb 15 00:00:00 EST 2010 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3304185· OSTI ID:21347134

Rouhani, M H; Maraghechi, B ^[1]

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1. Department of Physics, Amirkabir University of Technology, 15875-4413 Tehran (Iran, Islamic Republic of)

A one-dimensional and nonlinear simulation of a free-electron laser with a prebunched electron beam, a planar wiggler, and ion-channel guiding is presented. Using Maxwell's equations and full Lorentz force equation of motion for the electron beam, a set of coupled nonlinear differential equations is derived in slowly varying amplitude and wave number approximation and is solved numerically. This set of equations describes self-consistently the longitudinal dependence of radiation amplitude, growth rates, space-charge amplitude, and wave numbers together with the evolution of the electron beam. Because of using full Lorentz force equation of motion, it is possible to treat the injection of the beam into the wiggler. The electron beam is assumed cold, propagates with a relativistic velocity, ions are assumed immobile, and slippage is ignored. The effect of prebunched electron beam on saturation is studied. Ion-channel density is varied and the results for groups I and II orbits are compared with the case when the ion channel is absent. It is found that by using an ion channel/a prebunched electron beam growth rate can be increased, saturation length can be decreased, and the saturated amplitude of the radiation can be increased.

• OSTI ID: 21347134
• Journal Information: Physics of Plasmas, Vol. 17, Issue 2; Other Information: DOI: 10.1063/1.3304185; (c) 2010 American Institute of Physics; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
AMPLITUDES
APPROXIMATIONS
BEAM-PLASMA SYSTEMS
ELECTRON BEAMS
EQUATIONS OF MOTION
FREE ELECTRON LASERS
MAXWELL EQUATIONS
NONLINEAR PROBLEMS
PLASMA DENSITY
PLASMA SIMULATION
SPACE CHARGE
BEAMS
CALCULATION METHODS
DIFFERENTIAL EQUATIONS
EQUATIONS
LASERS
LEPTON BEAMS
PARTIAL DIFFERENTIAL EQUATIONS
PARTICLE BEAMS
SIMULATION