Emittance measurements of FEL accelerators using optical transition radiation methods

Measurements of the emittance of the Boeing free electron laser accelerator operating at 107 MeV, were performed using optical transition radiation (OTR). The results of the three measurement methods, measurement of beam spot size as a function of magnetic quadrupole focusing strength, two screen beam spot measurements, and beam spot-divergence measurements using an OTR interferometer, are compared and shown to be in excellent agreement.<
>