Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.024801
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- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering
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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 tau(c) = (2.0 +/- 1.0) fs. The data suggest a mean x-ray pulse duration of (29 +/- 14) fs behind the monochromator for (100 +/- 14) fs long electron pulses.
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