CERN Accelerating science

Article
Title	Design Study of a Compact Megawatt Class FEL Amplifier Based on the VISA Undulator
Author(s)	Watanabe, T ; Liu, D F L ; Murphy, J B ; Pinayev, I P ; Rose, J ; Shaftan, T V ; Skaritka, J ; Tanabé, T ; Tsang, Thomas ; Wang, X J ; Yu, L H
Affiliation	(BNL, Upton, Long Island, New York UCLA, Los Angeles, California NRL, Washington, DC)
Publication	2005
In:	27th International Conference on Free Electron Lasers, Palo Alto, CA, USA, 21 - 26 Aug 2005, pp.320
Subject category	Accelerators and Storage Rings
Abstract	The design of a Short Rayleigh Length (SRL) FEL amplifier based on the strong focusing VISA undulator [1] is presented in this study. The SRL FEL amplifier will be operating in the IR (0.8 - 1 μm), and consists of a two-meter VISA undulator with a peak seed laser power of about 1 kW. The FEL power and transverse mode evolution along the undulator were investigated using the three-dimensional numerical code GENESIS1.3. The evolution of the FEL output from the undulator exit to the first downstream optics is also studied. The possibility of using the proposed amplifier for a two-stage cascaded HGHG FEL [2] at the BNL SDL is also explored. The design parameters and the numerical results will be presented.