Threedimensional simulation of finite pulse effects in SASE via LienardWiechert fields
Abstract
The common method of modeling 3D freeelectron laser physics is based on the numerical treatment of paraxial wave equation coupled to the relativistic singleparticle equations of motion. The following analysis of selfamplified spontaneous emission (SASE) employs an alternative approach using LienardWiechert solution of the four vector wave equation for point charges in conjunction with Lorentz force equations to determine electron's motion and the evolution of the resulting 3D radiation fields. Besides its inherent simplicity, the approach allows to include important aspects of SASEFELs, such as startup from initial spontaneous emission, slippage of the optical pulse, interelectron Coulomb fields, multifrequency effects and transverse mode behavior of the optical wave. Simulation results illustrating electron phase dynamics as well as temporal, spectral and spatial characteristics of the radiation fields generated by a short pulse are presented and compared with available theory.
 Publication:

Nuclear Instruments and Methods in Physics Research A
 Pub Date:
 February 1997
 DOI:
 10.1016/S01689002(97)004385
 Bibcode:
 1997NIMPA.393..104T