A Free Electron Laser Based on a Sectional System of RF Undulators
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An efficient mode of the multistage capture and deceleration of particles in a sectioned undulator system for use in free electron lasers. This scheme is based on using a series of RF undulators with profiled resonant parameters that are powered by the independent powerful pulsed RF oscillators. The proposed mode allows efficiency to be obtained at a level of several percent in short-wavelength free electron lasers based on using dense bunches of electrons with relatively high energy spreads, formed in state-of-the-art laser plasma accelerators.
This work was supported by the Russian Science Foundation, project no. 18-02-00765. Some of the work was done as part of a State Task for the Institute of Applied Physics, Russian Academy of Sciences, project no. 0035-2014-0013.