Direct 2D spatial-coherence determination using the Fourier-analysis method: 
multi-parameter characterization of the P04 beamline at PETRA III

Bagschik, Kai; Wagner, Jochen; Buß, Ralph; Riepp, Matthias; Philippi-Kobs, André; Müller, Leonard; Buck, Jens; Trinter, Florian; Scholz, Frank; Seltmann, Jörn; Hoesch, Moritz; Viefhaus, Jens; Grübel, Gerhard; Oepen, Hans Peter; Frömter, Robert

doi:10.1364/OE.382608

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Direct 2D spatial-coherence determination using the Fourier-analysis method: multi-parameter characterization of the P04 beamline at PETRA III

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Trinter, Florian
Deutsches Elektronen-Synchrotron (DESY);
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Bagschik, K., Wagner, J., Buß, R., Riepp, M., Philippi-Kobs, A., Müller, L., et al. (2020). Direct 2D spatial-coherence determination using the Fourier-analysis method: multi-parameter characterization of the P04 beamline at PETRA III. Optics Express, 28(5), 7282-7300. doi:10.1364/OE.382608.

Cite as: https://hdl.handle.net/21.11116/0000-0005-F685-F

Abstract

We present a systematic 2D spatial-coherence analysis of the soft-X-ray beamline P04 at PETRA III for various beamline configurations. The influence of two different beam-defining apertures on the spatial coherence properties of the beam is discussed and optimal conditions for coherence-based experiments are found. A significant degradation of the spatial coherence in the vertical direction has been measured and sources of this degradation are identified and discussed. The Fourier-analysis method, which gives fast and simple access to the 2D spatial coherence function of the X-ray beam, is used for the experiment. Here, we exploit the charge scattering of a disordered nanodot sample allowing the use of arbitrary X-ray photon energies with this method.