Mainz 2017 – scientific programme

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A: Fachverband Atomphysik

A 20: Poster Session I

A 20.23: Poster

Tuesday, March 7, 2017, 17:00–19:00, P OG1

Spectral characterization of SASE bunch trains — •Philipp Schmidt, Philipp Reiß, Gregor Hartmann, Christian Ozga, Martin Wilke, André Knie, and Arno Ehresmann — Institut für Physik and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany

The recent availability of short wavelength Free-Electron-Lasers (FELs) enabled the investigations of the nonlinear response of matter in the X-ray wavelength regime, i.e. at photon energies where the dominant interaction involves the strongly bound core electrons. Streak camera-type detectors are ideally suited to analyze the spontaneous and stimulated photon emissions after an target excitation driven by FELs. In combination with a suitable spectrometer they are able to spectrally and temporally resolve a single X-ray flash on the picosecond time scale. The inclusion of the spectral distribution of the laser pulse allows for an explicit selection of desired beam parameters that can vary greatly due to the statistical nature of the underlying SASE effect. This also applies to FEL sources like the FLASH facility in Hamburg and the upcoming European XFEL that employ long bunch trains of up to 3000 individual bunches to achieve high repetition rates. Here we want to present first results using an x-ray streak camera at FLASH to investigate the spectral and temporal correlations between SASE bunches in these bunch trains in realtime and for each shot.