Erlangen 2018 – scientific programme
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A: Fachverband Atomphysik
A 25: Poster Session I
A 25.38: Poster
Tuesday, March 6, 2018, 16:15–18:15, Redoutensaal
Automated re-establishment of the spatial overlap in XUV/XUV pump-probe experiments in the focus of CAMP at FLASH — •Nils Bernhardt1, Mario Sauppe1, Cédric Bomme2, Stefan Düsterer2, Benjamin Erk2, Torsten Feigl3, Erland Müller2, Jan P. Müller1, Christopher Passow2, Daniel Ramm2, Daniel Rolles2, 4, Dimitrios Rompotis2, Rolf Treusch2, Holger Weigelt2, Jannis Zimbalski1, Thomas Möller1, and Daniela Rupp1, 5 — 1TU Berlin — 2DESY — 3optikX fab — 4Kansas State University, USA — 5MBI Berlin
Double pulse experiments with high intensity short-wavelength free-electron lasers enable unprecedented insight into the light induced dynamics of matter on the nanoscale. The recently installed multilayer based split-and-delay unit for the multi-purpose end-station CAMP at FLASH provides sub-femtosecond resolution and long delays up to 650 picoseconds. For time-resolved experiments the two pulses have to be overlapped in the focus, but actuator inaccuracies lead to a slight variation of the beam angle for different delays and subsequently to a misalignment that needs to be corrected. In this work, we develop a routine that tracks the inaccuracies and automatically overlaps the double pulses within the focus plane.