CERN Accelerating science

Article
Title	Short Rayleigh Range Free Electron Laser Amplifiers
Author(s)	Yu, L H ; Liu, D F L ; Murphy, J B ; Rose, J ; Shaftan, T V ; Wang, X J ; Watanabe, T
Affiliation	(BNL, Upton, Long Island, New York)
Publication	2005
In:	27th International Conference on Free Electron Lasers, Palo Alto, CA, USA, 21 - 26 Aug 2005, pp.e-proc. TUPP044
Subject category	Accelerators and Storage Rings
Abstract	An important requirement for a high average power laser system is a manageable power density on the first optical element. One possibility to achieve this is a single pass amplifier which generates a short Rayleigh range (SRL) light beam. We present design parameters and calculated performances for several SRL configurations. These include a simulation of the optically guided (pinched) MW class FEL [1], the scalloped beam FEL amplifier [2] and high gain TOK amplifiers we propose to explore at our SDL facility.