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Title: Mode-selective amplification in a waveguide free electron laser with a two-sectioned wiggler
Authors: Kong, Michael G.
Keywords: Free electron lasers
Gain control
Millimeterwave generation
Mode competition
Undulator
Waveguides
Issue Date: 1998
Publisher: © IEEE
Citation: KONG, M.G., 1998. Mode-selective amplification in a waveguide free electron laser with a two-sectioned wiggler. IEEE Transactions on Plasma Science, 26 (1), pp. 85-91.
Abstract: One important issue in waveguide free electron lasers (FELs) involves an interaction of the electron beam with one waveguide mode at two different resonant frequencies. Since the low-frequency mode often has a higher pain, the usually preferred high-frequency mode is suppressed as a result of mode competition. In this paper, possible control of this mode competition is considered using a nonstandard wiggler magnet consisting of two cascaded wiggler sections with different periods and field strengths. It is demonstrated that with an appropriate differentiation between the two wiggler sections the high-frequency mode may be amplified preferentially. This mode-selective amplification may be used to suppress the low-frequency mode. A small signal gain formulation is developed for a waveguide FEL with such a two-sectioned wiggler arrangement and numerical examples are used to demonstrate its applicability to mode control in waveguide FELs. Effects of wiggler field errors and electron energy spread are also considered. It is shown that the requirement for wiggler field errors and electron energy spread in the two-sectioned wiggler arrangement is similar to that in the usual straight wiggler configuration
Description: This article was published in the journal, IEEE Transactions on Plasma Science [© 1998 IEEE] and is also available at: http://ieeexplore.ieee.org/ Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Version: Published
DOI: 10.1109/27.659536
URI: https://dspace.lboro.ac.uk/2134/5219
ISSN: 0093-3813
Appears in Collections:Published Articles (Electronic, Electrical and Systems Engineering)

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