Proposed visible FEL facility at Boeing

The design for a potential free electron laser (FEL), driven by a 120-MeV linac capable of generating 0.1-A macropulse average current beams at a duty factor of 0.6%, is described. The accelerator will employ a photo-injected, 18-MeV, 433-MHz linac as an injector [T.D. Hayward et al., Proc. 1995 Particle Accelerator Conf., Dallas, TX, USA (1995)], followed by a 1300-MHz longitudinal phase space “linearizer” a magnetic buncher, and seven sections of 1300-MHz, pulsed traveling wave linac structure. Pulse lengths of 7 ps will be attained with minimal distortion of the pulse profile and normalized 90% emittance of 30 ± 10 πmm mr. The wiggler and magnets used to transport the beam will be reclaimed from previous FEL demonstration experiments.