Efficiency enhancement of a two-beam free-electron laser using a nonlinearly tapered wiggler

doi:10.1088/1674-1056/21/3/034101

Abstract A nonlinear and non-averaged model of a two-beam free-electron laser (FEL) wiggler that is tapered nonlinearly in the absence of slippage is presented. The two beams are assumed to have different energies, and the fundamental resonance of the higher energy beam is at the third harmonic of the lower energy beam. By using Maxwell's equations and the full Lorentz force equation of motion for the electron beams, coupled differential equations are derived and solved numerically by the fourth-order Runge-Kutta method. The amplitude of the wiggler field is assumed to decrease nonlinearly when the saturation of the third harmonic occurs. By simulation, the optimum starting point of the tapering and the slopes for reducing the wiggler amplitude are found. This technique can be applied to substantially improve the efficiency of the two-beam FEL in the XUV and X-ray regions. The effect of tapering on the dynamical stability of the fast electron beam is also studied.

Keywords: free-electron lasers harmonic generation Kolmogorov entropy efficiency enhancement

Received: 02 August 2011
Revised: 06 September 2011
Accepted manuscript online:

PACS:	41.60.Cr	(Free-electron lasers)
	42.65.Ky	(Frequency conversion; harmonic generation, including higher-order harmonic generation)
	02.60.Cb	(Numerical simulation; solution of equations)
	94.20.wj	(Wave/particle interactions)

Corresponding Authors: B. Maraghechi,behrouz@aut.ac.ir
E-mail: behrouz@aut.ac.ir

Cite this article:

Maryam Zahedian, B. Maraghechi, and M.H. Rouhani Efficiency enhancement of a two-beam free-electron laser using a nonlinearly tapered wiggler 2012 Chin. Phys. B 21 034101

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Efficiency enhancement of a two-beam free-electron laser using a nonlinearly tapered wiggler

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