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A slow wave free-electron laser

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2 Author(s)
Tripathi, V.K. ; Lab. for Plasma Res., Maryland Univ., College Park, MD, USA ; Chuan Sheng Liu

A simple calculation of a free-electron laser in the Compton regime that uses a dielectric-lined waveguide is presented. The introduction of a dielectric lining in a free-electron laser considerably reduces the requirements on beam voltage for generating a given frequency ω1=k0c/(1 - vb η/c), where k0 is the wiggler wave period η is the effective index of refraction (1<η<√ε) and ε is the permittivity. The system supports electromagnetic waves whose Poynting flux is largely concentrated in the dielectric; hence the electron beam is required to propagate close to the dielectric lining. The mode structure and dispersion behavior of the guiding system without the beam are discussed. a thin annular beam is introduced, and a perturbation theory is used to obtain the frequency and growth rate of radiation

Published in:

Plasma Science, IEEE Transactions on  (Volume:17 ,  Issue: 4 )

Date of Publication:

Aug 1989

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