Single shot spatial and temporal coherence properties of the SLAC Linac Coherent Light Source in the hard x-ray regime |
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| Authors: | Gutt C Wochner P Fischer B Conrad H Castro-Colin M Lee S Lehmkühler F Steinke I Sprung M Roseker W Zhu D Lemke H Bogle S Fuoss P H Stephenson G B Cammarata M Fritz D M Robert A Grübel G |
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| Institution: | Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany. christian.gutt@desy.de |
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| Abstract: | We measured the transverse and longitudinal coherence properties of the Linac Coherent Light Source (LCLS) at SLAC in the hard x-ray regime at 9 keV photon energy on a single shot basis. Speckle patterns recorded in the forward direction from colloidal nanoparticles yielded the transverse coherence properties of the focused LCLS beam. Speckle patterns from a gold nanopowder recorded with atomic resolution allowed us to measure the shot-to-shot variations of the spectral properties of the x-ray beam. The focused beam is in the transverse direction fully coherent with a mode number close to 1. The average number of longitudinal modes behind the Si(111) monochromator is about 14.5 and the average coherence time τ(c)=(2.0±1.0) fc. The data suggest a mean x-ray pulse duration of (29±14) fs behind the monochromator for (100±14) fc electron pulses. |
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