Synchrotron-based ultrafast x-ray diffraction at high repetition rates |
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Authors: | Navirian H Shayduk R Leitenberger W Goldshteyn J Gaal P Bargheer M |
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Affiliation: | Helmholtz-Zentrum Berlin fu?r Materialien und Energie GmbH, Wilhelm-Conrad-Ro?ntgen Campus, BESSY II, Albert-Einstein-Str. 15, 12489 Berlin, Germany. |
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Abstract: | We present a setup for ultrafast x-ray diffraction (UXRD) based at the storage ring BESSY II, in particular, a pump laser that excites the sample using 250 fs laser-pulses at repetition rates ranging from 208 kHz to 1.25 MHz. We discuss issues connected to the high heat-load and spatio-temporal alignment strategies in the context of a UXRD experiment at high repetition rates. The spatial overlap between laser pump and x-ray probe pulse is obtained with 10 μm precision and transient lattice changes can be recorded with an accuracy of δa/a(0) = 10(-6). We also compare time-resolved x-ray diffraction signals from a laser excited LSMO/STO superlattice with phonon dynamics simulations. From the analysis we determine the x-ray pulse duration to 120 ps in standard operation mode and below 10 ps in low-α mode. |
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