Title

Mode Competition In Long-Pulse Fels

Comments

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Abbreviated Journal Title

Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip.

Keywords

Instruments & Instrumentation; Nuclear Science & Technology; Physics ; Particles & Fields; Spectroscopy

Abstract

The nonlinear mode interaction in FELs is studied in an analytic perturbative framework both for low as well as high gain regimes. The mode coupling depends on the saturation terms which mainly arise from third order perturbation. Both self- and crossed saturation are obtained and the ratio crossed/self characterizes the strength of the mode coupling. The mode competition is analyzed by studying the two mode problem. Mathematically, this entails a stability analysis of a system of two coupled integro-differential equations. In FELs the crossed saturation is twice as strong as the self-saturation. As a consequence of the strong crossed saturation, a dominant mode is able to suppress other competing modes and the result is single mode operation.

Journal Title

Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment

Volume

285

Issue/Number

1-2

Publication Date

1-1-1989

Document Type

Article; Proceedings Paper

Language

English

First Page

132

Last Page

135

WOS Identifier

WOS:A1989CF64600024

ISSN

0168-9002

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