P. Skopintsev1,2,3, A. Singer1, J. Bach4, L. Müller1, B. Beyersdorff2, S. Schleitzer1, O. Gorobtsov1, A. Shabalin1, R.P. Kurta1, D. Dzhigaev1,5, O.M. Yefanov1, L. Glaser1, Sakdinawat6, G. Grübel1,7, R. Frömter4, H.P. Oepen4, J. Viefhaus1, I.A. Vartanyants1,5 Characterization of Spatial Coherence of Synchrotron Radiation with Non-Redundant Arrays of Slits. Double pinholes (DP) diffraction and coherence Light beam passing two slits forms a spot with interference pattern. Contrast depends on beam spatial coherence, which can be measured as satellite peak heights in Fourier space of the detector image. 3. Multiple slits diffraction (NRA) Peak heights: Each satellite peak corresponds to certain distance at which spatial coherence can be found [3] 1. Complex degree of coherence (CDC) CDC can be taken as a measure of spatial coherence if time effects on contrast are low [2], i.e. Experiment : P04 beamline layout, PETRA III at DESY Transverse coherence measured with DP Transverse coherence measured with NRA‘s [1] P.Skopintsev et al., J. Synchrotron Rad. (2014), 21 [2] J.W. Goodman, Statistical optics [3] Y. Mejia and A. I. Gonzalez, Opt. Commun. (2007), 273, 428 Contact > Results with NRAs and double pinholes are identical. >NRA method works better with large beams. >NRA approach allows to measure transverse coherence at several distances simultaneously. >It might be extremely useful for unstable radiation sources such as free electron lasers. Transverse coherence for different photon energies 403 eV 400 eV eV Conclusions & Outlook References 1. Monochromator exit slits adjust photon energy. 2. Coherence length different for different energies. 3. Highest for blue-shifted beam. Fourier space Diffraction pattern Results Six slits 15 distances Two pinholes 1 distance 400 eV 800 eV (low) - Six slits NRA - Double pinholes Fourier space Diffraction pattern 1. Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany 2. National Research Center ‘Kurchatov Institute’, Kurchatov Square 1, Moscow, Russia 3. Moscow Institute of Physics and Technology (State University), Dolgoprudny, , Russia 4. Universität Hamburg, Institut für Angewandte Physik, Hamburg, Germany 5. National Research Nuclear University, ‘MEPhI’, Moscow, Russia 6. SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA 7. The Hamburg Center for Ultrafast Imaging, Hamburg, Germany Theory 2. Diffraction patternFourier space 0. Fully coherent Part. coherent Incoherent Introduction We present a method to characterize spatial cohe-rence of soft X-ray radiation from a single diffraction pattern. The technique is based on scattering from non-redundant arrays (NRA) of slits and records the degree spatial coherence at several separations from one to 15 µm. Using NRAs we mea-sured vertical spatial cohe-rence of P04 beamline of PETRA III synchrotron for different beam parameters [1]. To verify the results obtained with NRAs additional Young’s double pinholes experiments were conducted and show good agreement. Beam FWHM = 11 ± 1 µm Beam FWHM = 42 ± 2 µm