CERN Accelerating science

Article
Title	Measurement and Calculation of the 'Electron Efficiency' on the CLIO’ Free-Electron Laser
Author(s)	Prazeres, Rui ; Glotin, F ; Ortéga, J M
Affiliation	(LURE, Orsay)
Publication	2004
In:	26th International Free Electron Laser Conference and 11th FEL User Workshop 2004, Trieste, Italy, 29 Aug - 3 Sep 2004, pp.e-proc. THPOS06
Subject category	Accelerators and Storage Rings
Abstract	This paper describe recent measurements which have been performed with the CLIO FEL in the wavelength range 40 to 120µm. The FEL electron efficiency, η, is deduced from the electron energy loss. It gives an absolute measurement of the optical power produced by the electron beam, which is then compared to the extracted power of the FEL measured optically. The ratio is compared to numerical simulation taking into account the diffraction of the optical mode in the optical cavity and in the beam line.