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- W2083348356 abstract "Sideband growth in tapered wiggler free electron lasers (FELs) is studied in general, and the growth rate dependence on the tapering gradient is given analytically. While earlier work considered the zero energy spread limit with particles at the bottom of the bucket, here full energy spread across the bucket is considered, resulting in different growth scaling. Particles at a given bucket location, parameterized by the action J, go in an out of resonance with a given sideband frequency 2γz2Ω(J;z)=ω±−ωo, as the bounce frequency Ω(J;z) varies along the interaction length z. Therefore, the gain per sideband frequency is reduced relative to a fixed wiggler. Instead of being determined by the fraction particles that stay in resonance, proportional to the inverse shear (dΩ/dJ)−1, here the sideband gain is proportional to the fraction of the interaction length ∝(dΩ/dz)−1 that most particles spent in resonance. Other thing being equal, the sideband gain per frequency interval is reduced as G(ω)≃Go(ω)Lt/Lw, where Lt,Lw are the tapering and wiggler lengths and G0(ω) the gain for untapered wiggler. The maximum growth spreads over a wide frequency band yielding a continuum sideband spectrum." @default.
- W2083348356 created "2016-06-24" @default.
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- W2083348356 date "2000-05-01" @default.
- W2083348356 modified "2023-10-16" @default.
- W2083348356 title "Sideband suppression in tapered wiggler free electron lasers including thermal spreads" @default.
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- W2083348356 doi "https://doi.org/10.1063/1.873979" @default.
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