Abstract:
Experiments are reported on the effects of electron prebunching in a mildly relativistic, low-current (200-KV, 1-A) free-electron laser amplifier operating in the collect...Show MoreMetadata
Abstract:
Experiments are reported on the effects of electron prebunching in a mildly relativistic, low-current (200-KV, 1-A) free-electron laser amplifier operating in the collective (Raman) regime at a frequency of approximately 10 GHz. Prebunching is established by injecting an electromagnetic wave into a bifilar helical wiggler and then transporting the bunched beam into a second magnetic wiggler region. The wave growth rate is deduced from measurements of the radiation intensity as a function of interaction length. Observations show that prebunching can increase the radiation growth rate manyfold as compared with a system without prebunching. Studies are presented both in the small-signal (linear) regime, and in the nonlinear (saturated) regime.<>
Published in: IEEE Journal of Quantum Electronics ( Volume: 24, Issue: 9, September 1988)
DOI: 10.1109/3.7122
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