Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics III

Q 62.76: Poster

Thursday, March 26, 2015, 17:00–19:00, C/Foyer

Design of an XUV and soft X-ray split-and-delay unit for FLASH II — •Sebastian Roling, Björn Siemer, Frank Wahlert, Michael Wöstmann, and Helmut Zacharias — Westfälische Wilhelms-Universität Münster

An XUV and soft X-ray split-and-delay unit is designed that enables time-resolved experiments covering the whole spectral range of FLASH II from hν = 30 eV to about 2500 eV. With wave front beam splitting and grazing incidence angles a maximum delay of -6 ps < Δ t < +18 ps will be possible with a sub-fs resolution. Two different coatings are required to cover the complete spectral range. Therefore, a design that is based on the three dimensional beam path of the SDU at BL2 at FLASH has been developed which allows to choose 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 θ = 1.8^∘. With a Pt-coating a transmission of T > 13% will be possible for photon energies up to hν = 1500 eV. For a future upgrade of FLASH II the grazing angle can be changed to hν = 1.3^∘ in order to cover a range up to hν = 2500 eV.