UCSB (University of California Santa Barbara) two-stage FEL (free-electron laser) experiment. Technical report No. 63, 1 October 1985-30 December 1986

A two-stage FEL experiment is under development at the UCSB FEL facility. The experiment uses a high-quality 20-ampere electron beam generated by an electrostatic accelerator with beam recovery. A new gun and collector were developed for this experiment. The first stage, with a helical undulator, will produce a saturation flux of the order of 10/sup 7/ watts/cm/sup 2/ radiation. This will be the pump for the second stage where light of 1.08 micrometers will be generated.