Measurement of the Temporal and Spatial Phase Variations of a Pulsed FreeElectron Laser Amplifier

摘要

We report temporal and spatial phase measurements of a pulsed free electron laseramplifier (FEL) operating in combined wiggler and axial guide magnetic fields. The system uses a mildly relativistic electron beam (750 kV, 90-300 A, 30 ns), and is excited by a high power 33.39 GHz magnetron source. The phase during the voltage pulse Is measured by an interferometric technique from which frequency chirping is determined. (MM).