Theory of nonlinear harmonic generation in free-electron lasers with helical wigglers

被引：10

作者：

Geloni, Gianluca ^{[1
]}

Saldin, Evgeni ^{[1
]}

Schneidmiller, Evgeni ^{[1
]}

Yurkov, Mikhail ^{[1
]}

机构：

[1] DESY, D-2000 Hamburg, Germany

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2007年 / 581卷 / 03期

关键词：

free-electron laser (FEL); Nonlinear harmonic generation; helical wiggler; even harmonics;

D O I：

10.1016/j.nima.2007.08.152

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Coherent Harmonic Generation (CHG), and in particular Nonlinear Harmonic Generation (NHG), is of importance for both short wavelength Free-Electron Lasers (FELs), in relation with the achievement of shorter wavelengths with a fixed electron-beam energy, and high-average-power FEL resonators, in relation with destructive effects of higher harmonics radiation on mirrors. In this paper we present a treatment of NHG from helical wigglers with particular emphasis on the second harmonic. Our study is based on an analytical solution of Maxwell's equations, derived with the help of a Green's function method. In particular, we demonstrate that nonlinear harmonic generation (NHG) from helical wigglers vanishes on axis. Our conclusion is in open contrast with results in literature, which include a kinematical mistake in the description of the electron motion. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：856 / 865

页数：10

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