Unaveraged three-dimensional modelling of the FEL
C.K.W. Nam, P. Aitken, and B.W.J. McNeil,
TL;DR
This paper introduces a novel 3D model for free-electron lasers that captures spontaneous emission and non-local electron effects by solving unaveraged Maxwell-Lorentz equations numerically.
Contribution
It presents a minimally assumption-dependent 3D FEL model that does not average over the longitudinal coordinate, enabling detailed simulation of spontaneous emission and non-localized electron dynamics.
Findings
Successfully models coherent spontaneous emission.
Captures non-localized electron propagation effects.
Uses parallel Fourier split-step numerical method.
Abstract
A new three dimensional model of the FEL is presented. A system of scaled, coupled Maxwell Lorentz equations are derived in the paraxial limit. A minimal number of limiting assumptions are made and the equations are not averaged in the longitudinal direction of common radiation/ electron beam propagation, allowing the effects of coherent spontaneous emission and non-localised electron propagation to be modelled. The equations are solved numerically using a parallel Fourier split-step method.
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Taxonomy
TopicsParticle Accelerators and Free-Electron Lasers · Particle accelerators and beam dynamics · Gyrotron and Vacuum Electronics Research