Hamburg 2009 – scientific programme
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MO: Fachverband Molekülphysik
MO 23: Molekülphysik Poster 2
MO 23.12: Poster
Thursday, March 5, 2009, 16:30–19:00, VMP 8 Foyer
A new XUV Autocorrelator for Pump-Probe Experiments and Pulse Diagnostics at FLASH — Michel Toppin1, Oliver Herrwerth2, Matthias Lezius2, Matthias Kling2, Moritz Kurka1, Artem Rudenko1, Claus Dieter Schröter1, Yuhai Jiang1, Kai-Uwe Kühnel1, Lutz Foucar3, Rolf Treusch4, Michael Gensch4, •Robert Moshammer1, and Joachim Ullrich1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, D-85748 Garching — 3Institut für Kernphysik, Universität Frankfurt, D 60486 Frankfurt — 4DESY, Notkestrasse 85, 22607 Hamburg
A split-mirror setup for the focussing of XUV radiation was designed and brought into operation at the free-electron laser at Hamburg (FLASH). It consists of a spherical multi-layer mirror (50 cm focal length) that is cut into two identical half-mirrors ("half-moon" geometry). The whole mirror is operated in on-axis back-reflection mode. While one half-mirror is mounted at a fixed position, the other one is movable by means of a high precision piezo-stage along the beam axis. This way a time delay between both reflected light beams is adjustable within a range of ±1500 fs at a resolution of better than 1 fs. The foci of both mirrors are merged inside a dilute, well localized (less than 1 mm diameter) and cold atomic or molecular beam in the centre of a Reaction Microscope for momentum resolved detection of created electrons and ions. First results will be presented.