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13 May 1994 Observation of frequency chirping and phase of a free-electron laser amplifier
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Proceedings Volume 2154, Intense Microwave Pulses II; (1994)
Event: OE/LASE '94, 1994, Los Angeles, CA, United States
We report observations of frequency chirping and phase of a free electron laser amplifier operating in the Raman regime. The FEL is driven by a mildly relativistic electron beam (750 kV, 25 ns) subjected to a combined axial magnetic field and a helical wiggler field. The input into the FEL amplifier is provided by a high power magnetron tuned to a frequency of 33.39 GHz. Phase and frequency shifts are measured both as a function of time and interaction length. It is found that in the Group I regime of FEL operation the output frequency is upshifted by approximately 100 MHz, but smaller upshifts are observed in the Group II or the reversed field configurations.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kenneth N. Ricci, George Bekefi, Brian Chen, Manoel E. Conde, Ivan Mastovsky, Colin J. Taylor, and P. Volfbeyn "Observation of frequency chirping and phase of a free-electron laser amplifier", Proc. SPIE 2154, Intense Microwave Pulses II, (13 May 1994);

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