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K: Fachverband Kurzzeitphysik

K 4: Poster

K 4.3: Poster

Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof

An XUV and soft X-ray split-and-delay unit for FLASH II — •Matthias Rollnik, Sebastian Roling, Frank Wahlert, Michael Wöstmann, and Helmut Zacharias — Westfälische Wilhelms-Universität Münster, Germany

An XUV and soft X-ray split-and-delay unit is built that enables time-resolved pump-probe experiments covering the whole spectral range of FLASH II from hν = 30 eV up to 1500 eV. With wave front beam splitting and grazing incidence angles sub-fs resolution with a maximum delay of -6 ps < Δ t < +18 ps will be achieved. Two different coatings are required to cover the complete spectral range. Therefore, a design that is based on a three dimensional beam path allows choosing the propagation via two sets of mirrors with these coatings. A Ni coating will allow a total transmission on the order of T = 55 % for photon energies between hν≈ 30 eV and 600 eV at a grazing angle of θ = 1.8^∘ in the variable delay line. With a Pt coating at a grazing angle of θ = 1.3^∘ a transmission of T > 29 % will be possible for photon energies up to hν = 1500 eV. For a future upgrade of FLASH II the Ni coating can be used at a grazing angle of θ = 1.3^∘ to cover a range up to hν≈ 2500 eV.