München 2019 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 6: Free-Electron Lasers

AKBP 6.7: Talk

Tuesday, March 19, 2019, 15:30–15:45, HS 8

Off-Angle Harmonic Seeding at the Short-Pulse Source at DELTA — •Arne Meyer auf der Heide, Benedikt Büsing, Shaukat Khan, Daniel Krieg, Carsten Mai, and Frederik Teutenberg — Zentrum für Synchrotronstrahlung (DELTA), TU Dortmund, Deutschland

At the 1.5-GeV synchrotron light source DELTA operated by the TU Dortmund University, coherent harmonic generation (CHG) is employed to provide ultrashort pulses in the vacuum ultraviolet and terahertz regime. Here, a modulation of the electron energy induced by an interaction of an ultrashort laser pulse with an electron bunch within an undulator (modulator) tuned to the laser wavelength is transformed into a density modulation by a magnetic chicane. This results in the emission at harmonics of the laser wavelength as well as pulses in the THz regime. Recently, seeding experiments were performed with the laser wavelength being a harmonic of the undulator wavelength. The energy modulation tends to follow the angular distribution of spontaneous radiation at the respective undulator harmonic, e.g., an off-axis maximum for the second harmonic when seeding with 400-nm pulses while tuning the modulator to 800 nm. Measurements and simulation results will be shown and possible applications will be discussed. Funded by BMBF under contract 05K16PEA and by the Land Berlin