Abstract
Abstract A theory of linear and nonlinear interaction of fast electromagnetic waves with a slow cyclotron wave of relativistic electron beam in an FEL with circularly polarized wiggler field and longitudinal guide field is presented. It is shown that such interaction is a twice parametric process with regard to the wiggler field. As a result the spatial growth rate of the electromagnetic wave in the linear regime, and the inherent efficiency of interaction are smaller than those for the undulator synchronism. The optimal length of the interaction region is also found to be larger. Nevertheless, within the certain limits of the positive guide field strength the operational frequency of a slow cyclotron wave FEL can be higher than that of the standard FEL and the resultant efficiency of an FEL-oscillator in the millimeter wavelength range can be of 5–10%. The use of the wiggler or guide field tapering to optimize efficiency of such an FEL is discussed. A numerical simulation showed that the efficiency of an FEL on a slow cyclotron wave with tapered wiggler field could reach the 25% level, thus demonstrating the potential of that FEL to compete with other sources of coherent microwaves. Features of nonlinear regime are discussed and results of numerical simulation are presented.
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: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
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.
