Single shot coherence properties of the free-electron laser SACLA in the hard X-ray regime.

ABSTRACT: We measured the coherence properties of the free-electron laser SACLA on a single shot basis at an X-ray energy of 8 keV. By analysing small-angle X-ray scattering speckle patterns from colloidal dispersions we found a degree of transverse coherence of βt = 0.79 ± 0.09. Taking detector properties into account, we developed a simulation model in oder to determine the degree of coherence from intensity histograms. Finally we calculated a coherence time of τc = 0.1 fs and a pulse duration of 5.2 fs which corresponds with previous predictions.

SUBMITTER: Lehmkuhler F 

PROVIDER: S-EPMC4050387 | biostudies-other | 2014

REPOSITORIES: biostudies-other