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A: Fachverband Atomphysik
A 28: Interaction with VUV and X-ray light
A 28.1: Poster
Donnerstag, 17. März 2022, 16:30–18:30, P
An XUV and soft X-ray split-and-delay unit for FLASH2 — •Matthias Dreimann1, Dennis Eckermann1, Felix Rosenthal1, Sebastian Roling2, Frank Wahlert2, Sven Eppenhoff2, Marion Kuhlmann3, Sven Toleikis3, Rolf Treusch3, Elke Plönjes-Palm3, and Helmut Zacharias1 — 1Center for Soft Nanoscience, WWU Münster, 48149 Münster, Germany — 2Physikalisches Institut, WWU Münster, 48149 Münster, Germany — 3Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany
A split-and-delay unit for the XUV and soft X-ray spectral range has been installed at beamlines FL23 and FL24 at the FLASH2 Free-Electron Laser at DESY. It enables time-resolved pump-probe experiments covering the whole spectral range of FLASH2 from 30 eV up to 1800 eV. Using wavefront beam splitting and grazing incidence mirrors a sub-fs resolution with a relative pulse delay of −5 ps ≤ Δτ ≤ +18 ps is achieved. Two different mirror coatings are required to cover the complete spectral range and thus, a design that is based on a three dimensional beam path was developed. This allows the choice between different sets of mirrors with either coating for the fixed branch. A Ni coating allows a total transmission above T > 0.50 for photon energies between hν = 30 eV and 650 eV at a grazing angle of a ϑvariable = 1.8∘ in the beam path with variable delay. With a Pt coating a transmission of T > 0.06 is possible for photon energies up to hν = 1800 eV. In the fixed beam path at a grazing angle of ϑfixed = 1.3∘ a transmission of T > 0.61 with a Ni coating and T > 0.23 with a Pt coating is possible.