Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 16: Poster II

A 16.6: Poster

Tuesday, March 12, 2024, 17:00–19:00, Tent B

An upgraded XUV and soft X-ray split-and-delay unit for FLASH1 — •Matthias Dreimann, Michael Wöstmann, and Helmut Zacharias — Center for Soft Nanoscience, Universität Münster, Germany

A split-and-delay unit (SDU) is upgraded that enables time-resolved pump-probe experiments at FLASH1. With the original design first experiments were performed in 2007 and the SDU was permanently incorporated in the BL2 at FLASH1 in 2010. The planned delay range of this device is -1 ps < Δt < +10 ps with a subfemtosecond temporal delay. The upgrade will increase the spectral range of the SDU from hν = 30 eV up to hν = 750 eV. Two different coatings are required achieve a high transmission in this 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 C coating will allow a total transmission on the order of T > 0.74 for photon energies between hν * 30 eV and hν = 200 eV at a grazing angle of θ = 3.0° in the variable beam path. A Ni coating can be used to cover a range up to hν = 750 eV at a transmission of T > 0.08.

Keywords: time-resolved pump-probe; Free-Electron Laser; non-linear light-matter interaction,; ultrashort pulses; attosecond physics