Design Of Teafel, A Recirculating 3-12 MeV Electron Beam System For FELs

The design of a 6 and 12 MeV electrostatic-accelerator FEL is presented. The system will use recirculation of the electron beam in order to obtain ampere level currents. Energy variability, coupled with the use of short-period undulators, will allow continuous tunability of the system over wavelengths between 8 and 120 /spl mu/m.