Off-axis gain enhancement in a free-electron laser in the long undulator regime |
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| Affiliation: | 1. Institute of Physics, University of Graz, NAWI Graz, Universitätsplatz 5, 8010 Graz, Austria;2. Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany |
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| Abstract: | The small-signal gain of a free-electron laser with a linearly polarized undulator is investigated for the case where the electron emits at a slight angle with respect to its direction of propagation. In the long cavity (warm beam) regime the gain off axis if compared for constant frequency can be higher than the gain axis by about order of magnitude. |
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