Abstract
Amplification and generation schemes of free electron lasers with a helical undulator and homogeneous guiding magnetic field are considered. A description of the process of pumping bounce oscillations of electrons in the adiabatically tapered undulator field is presented. The electron beam interacts with the electromagnetic wave in the region of constant amplitude of the undulator field where electrons move along stationary helical trajectories. Linear and nonlinear theory of such interaction is developed when electrons are under the undulator and combined synchronism with the electromagnetic wave. In the latter case the radiation is accompanied by excitation of electron oscillations near the equilibrium trajectory. A range of parameters for undulator synchronism is found where a considerable Doppler frequency up-conversion can be realized simultaneously with high efficiency (for amplifiers more then 30%). The mechanism of efficiency enhancement in this region is described. The influence of HF space charge (including negative mass effects) and the transverse inhomogeneity of the undulator field is discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Journal of High Speed Electronics and Systems
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
