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Effect of reflections and losses in Smith-Purcell free-electron lasers

Abstract : We have included the effects of losses in the grating surface and reflections at the ends of the grating in the theory of Smith-Purcell free-electron lasers. Computations show that losses typically increase the start current by about 10%. The complex reflection coefficient for the evanescent wave is computed using numerical simulations, and is found to have a magnitude on the order of 30%. This typically increases or decreases the start current by about 10%, depending on the phase of the round-trip reflection.
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H.L. Andrews, C.H. Boulware, C.A. Brau, J.T. Donohue, J. Gardelle, et al.. Effect of reflections and losses in Smith-Purcell free-electron lasers. New Journal of Physics, Institute of Physics: Open Access Journals, 2006, 8, pp.289. ⟨10.1088/1367-2630/8/11/289⟩. ⟨in2p3-00119765⟩

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