Experimental evidence for high-efficiency, low-brightness behavior in free-electron lasers

20 June 1994

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 72 (25) , 3985-3988
https://doi.org/10.1103/physrevlett.72.3985

Abstract

Spectral broadening is expected in free-electron laser (FEL) due to sideband generation and nonlinear mode coupling. For high enough electron current, the FEL beam presents an asymptotic regime characterized by a broad and turbulent spectrum. Theoretical investigations have shown that this regime also exhibits a strong efficiency enhancement and a universal low brightness. This paper reports experimental evidence for these new scaling laws using the rf linac-based ELSA FEL.

Keywords

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