CERN Accelerating science

Article
Title	Harmonic Inverse FEL Interaction at 800nm
Author(s)	Sears, C M S ; Colby, E R ; Siemann, R ; Spencer, J E
Affiliation	(SLAC, Menlo Park, California Stanford University, Stanford, Califormia)
Publication	2005
In:	27th International Conference on Free Electron Lasers, Palo Alto, CA, USA, 21 - 26 Aug 2005, pp.e-proc. TUPP056
Subject category	Accelerators and Storage Rings
Abstract	The inverse Free Electron Laser (IFEL) interaction has recently been proposed and demonstrated as a premodulator for High Gain Harmonic Generation (HGHG) experiments. These experiments utilized the fundamental of the interaction between the laser field and electron bunch. In the current experiment, we explore the higher order resonances of the IFEL interaction from a 3 period, 1.8 centimeter wavelength undulator with a picosecond, 0.25 mJ/pulse laser at 800nm. The resonances are observed by adjusting the gap of the undulator while keeping the beam energy constant. The harmonic IFEL can add flexibility to HGHG FEL design.