Hannover 2020 – wissenschaftliches Programm
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 4: Poster
K 4.2: Poster
Dienstag, 10. März 2020, 16:30–18:30, f428
An XUV and soft x-ray split-and-delay unit for FLASH2 — •Matthias Dreimann1, Sebastian Roling1, Ivan Zadyraka3, Marion Kuhlmann2, Elke Plönjes-Palm2, Frank Wahlert3, Felix Rosenthal1, Michael Wöstmann1, and Helmut Zacharias1 — 1Center for Soft Nanoscience, Münster, Germany — 2Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — 3Westfälische 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 FLASH2 from hv = 30 eV up to 1500 eV. With wavefront beam splitting and grazing incidence angles sub-fs resolution with a maximum delay of -6 ps < 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 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 hv = 30 eV and 600 eV at a grazing angle of w = 1.8° in the variable delay line. With a Pt coating a transmission of T > 13 % will be possible for photon energies up to hv = 1500 eV. In the fixed beam path at a grazing angle of w = 1.3° a transmission of T > 62 % with a Ni coating and T > 28 % with a Pt coating will be possible. For a future upgrade of FLASH2 the Ni coating can be used at a grazing angle of w = 1.3° to cover a range up to hv = 2500 eV.