Presentation_1_Minimum Spectral Bandwidth in Echo Seeded Free Electron Lasers.pdf (142.32 kB)
Presentation_1_Minimum Spectral Bandwidth in Echo Seeded Free Electron Lasers.pdf
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posted on 2019-03-22, 11:14 authored by Erik HemsingThis paper examines the impact of non-linear longitudinal phase distortions on the spectral bandwidth in echo seeded free electron lasers (FELs). It extends the existing theory developed in Hemsing [1] for echo-enabled harmonic generation (EEHG) to include finite laser pulse durations. An analytic expression for the shape of the optimized longitudinal bunching envelope is derived, and is used to determine the laser and electron beam pulse durations that minimize the seeded bandwidth in the presence of arbitrary phase distortions. The time-bandwidth product (TBP) is also derived, and is shown that the TBP and the bandwidth increase by no more than 2 from their transform-limited values when the bandwidth is minimized.
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