Single shot spatial and temporal coherence properties of the SLAC Linac Coherent Light Source in the hard x-ray regime.
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.
Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany. christian.gutt@desy.de
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C
Gutt
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Wochner
B
B
Fischer
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Conrad
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Castro-Colin
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Lee
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Lehmkühler
I
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Steinke
M
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Sprung
W
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Roseker
D
D
Zhu
H
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Lemke
S
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Bogle
P H
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Fuoss
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Stephenson
M
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Cammarata
D M
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Fritz
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Robert
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Grübel
D004583:Electrons; D006046:Gold / Q000737:chemistry*; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry*; D008962:Models, Theoretical; D049329:Nanostructures / Q000737:chemistry*; D010315:Particle Accelerators; D017785:Photons; D012542:Scattering, Radiation; D014965:X-Rays
D006046:Gold