140 GHz microwave FEL experiments using ELF-II☆

Abstract We describe the modeling, the experimental facility and the initial operating results for ELF-II, an induction-linac-based free-electron laser designed to produce up to 2 GW of peak power at 140 GHz ELF-II is the initial configuration of an FEL system which will eventually produce up to 2 MW of average power at a frequency of 250 GHz, for use in plasma heating experiments in the Microwave Tokamak Experiment.