Abstract
The paper, by means of Green's function and Fourier spectral theory, investigates spontaneous radiation of a single pulse electron bean in free electron lasers with a helically periodical magnetic field. It is found that there are fast and slow electroagnetic waves as well as normal in the interaction region, and that the energy spectrum of spontaneous emission is not only dependent on the imposed helical field, but also modulated sensitively by the electron beam pulse. Under some conditions, the spectrum may have main peaks more than one, showing oscillations, that is, the long pulse effect.
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Changbiao, W., Shenggang, L. The long pulse effect in FEL's. Int J Infrared Milli Waves 8, 583–594 (1987). https://doi.org/10.1007/BF01010631
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DOI: https://doi.org/10.1007/BF01010631