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Compensation of thermal loss in free-electron laser with optimal tapering and pre-bunching

Published online by Cambridge University Press:  21 May 2020

F. Bazouband Open the ORCID record for F. Bazouband [Opens in a new window]
F. Bazouband*
Affiliation:
Department of Physics, Fasa University, Fasa74616-86131, Iran
*
Author for correspondence: F. Bazouband, Department of Physics, Fasa University, Fasa74616-86131, Iran. E-mail: [email protected], [email protected]
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Abstract

Increasing the output power of a long-wavelength free-electron laser (FEL), despite the destroying effects of beam energy spread, is studied using the optimal pre-bunching of the thermal electron beam along with the optimal tapering of the planar wiggler magnetic field. A set of self-consistent coupled nonlinear differential equations in three dimensional that describe the evolution of radiation and electron beam in the interaction zone are solved numerically by the Runge–Kutta method. The axial energy spread is considered and it degrades the FEL performance by reducing the saturation power and increasing the saturation length. To compensate these destroying effects, the optimum function or degree of electron beam pre-bunching and optimum parameters of wiggler tapering are found by the successive runs of the simulation code.

Keywords

Axial energy spreadlong-wavelength free-electron laserpre-bunching of electron beamtapering of the planar wiggler magnetic field
Type
Research Article
Information
Laser and Particle Beams , Volume 38 , Issue 2 , June 2020 , pp. 141 - 147
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press

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