Hannover 2016 – scientific programme
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A: Fachverband Atomphysik
A 22: Interaction with VUV and X-ray light
A 22.3: Poster
Tuesday, March 1, 2016, 16:30–19:00, Empore Lichthof
Spatial overlap for XUV pump-probe experiments using the permanently installed split and delay unit DESC at the FLASH FEL — •J Zimbalski1, L Flückiger2,1, K Kolatzki1, B Langbehn1, M Müller1, M Sauppe1, B Senfftleben1, A Ulmer1, J Zimmermann1, T Zimmermann1, T Gorkhover1,3, C Bostedt3,4, C Bomme5, S Düsterer5, B Erk5, M Kuhlmann5, D Rolles5,6, D Rompotis5, R Treusch5, T Feigl7, T Möller1, and D Rupp1 — 1TU Berlin — 2La Trobe University, Melbourne — 3SLAC — 4Argonne National Lab, Northwestern University, Chicago — 5DESY — 6Kansas State University — 7optiX fab
Short wavelength free-electron lasers (FELs) enable novel experiments with a very high temporal and spatial resolution. Interaction of the ultra intense light pulses with matter results in complex dynamics on different timescales. To investigate such processes on a very broad timescale, long range split and delay units are required. The DElay Stage for CAMP DESC uses multilayer mirrors at almost perpendicular incidence to enable XUV-XUV pump-probe experiments with delays ranging from 0 fs to 650 ps.
A common problem when operating split and delay units is the loss of beam alignment and thus spatial overlap in the focus when changing the delay due to inaccuracies of the mirror actuators.
In DESC a closed-loop mirror mount allows for fast beam realignment.
Therefore a compensation curve was measured by establishing overlap on a
YAG-screen using a high resolution microscope as well as optimizing time-of-flight spectra of Xe clusters on high kinetic energies.