Mainz 2026 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

A: Fachverband Atomphysik

A 22: Poster – Attosecond Physics (joint session A/MO)

A 22.4: Poster

Mittwoch, 4. März 2026, 17:00–19:00, Philo 1. OG

Technical performance of the upgraded XUV and soft X-ray split-and-delay unit at FLASH1 — •Matthias Dreimann, Michael Wöstmann, and Helmut Zacharias — Center for Soft Nanoscience, Universität Münster

The split-and-delay unit at FLASH1, in operation since 2007, has been upgraded to meet the advances of increasing photon energies of FLASH1 since then. With the original design first experiments were performed in 2007 and the SDU was permanently incorporated in the BL2 at FLASH1 in 2010. The upgrade increases the spectral range of the SDU from former hv = 250 eV to now hv = 750 eV. Two different mirror coatings achieve a high transmission in the whole spectral range. The design is based on a three dimensional beam path and allows choosing the propagation via two sets of mirrors with different coatings. A carbon coating allows a total transmission on the order of T > 0.74 for photon energies between hv = 30 eV and hv = 200 eV at a grazing angle of 3.0° in the variable beam path. In the fixed beam path a shallower grazing angle of 2.5° is used, which yields a total transmission of T > 0.79. An Ni coating can be used to additionally cover a range up to hv = 750 eV. This results in a total transmission of typically T = 0.4 in the variable and T = 0.3 in the fixed beam path. The delay range of the new set-up is -1 ps < t < +9 ps with a subfemtosecond temporal delay.

Keywords: pump-probe; free-electron laser