Minimum Spectral Bandwidth in Echo Seeded Free Electron Lasers

Program Document · Tue Jan 01 00:00:00 EST 2019

OSTI ID:1498530

Hemsing, Erik ^[1]

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1. SLAC National Accelerator Lab., Menlo Park, CA (United States)

This 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 Ref.~\cite{HemsingBunchingPhase} 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 $$\sqrt{2}$$ from their transform-limited values when the bandwidth is minimized.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 1498530
• Country of Publication: United States
• Language: English