Dresden 2020 – scientific programme

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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 13: Free Electron Lasers

AKBP 13.1: Talk

Wednesday, March 18, 2020, 16:30–16:45, MOL 213

Electron beam characterisation based on seeded FEL properties — •Mathis Mewes — Universität Hamburg, Hamburg, Germany

The performance of high gain FELs strongly depends on the electron bunch properties. In seeded FEL mode the electron bunches are usually much longer than the XUV-pulse and therefore only the properties of the seeded slices are relevant to the lasing process. If complete time resolved electron beam diagnostics is not available one can try to characterize the electron bunch slices indirectly by analyzing the FEL output radiation. This approach has been used to determine the electron beam slice emittance and energy spread at the HGHG seeding experiment (sFLASH) at the Free-electron Laser in Hamburg. Furthermore time resolved measurements of the contrast of the seeded FEL with respect to SASE mode give the possibility to estimate the initial bunching factor and henceforth the induced energy modulation by the seeding laser pulse.