Coherence properties from speckle contrast analysis at the European XFEL

We show the results of speckle contrast analysis at the MID instrument of European XFEL in the hard X-ray regime. Speckle patterns measured from static colloidal samples are compared to results previously obtained at the SPB/SFX instrument. A high degree of coherence of 0.79 is obtained by modelling...

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Bibliographic Details
Published in:Journal of physics. Conference series 2022-12, Vol.2380 (1), p.12085
Main Authors: Dallari, F, Lokteva, I, Möller, J, Jain, A, Roseker, W, Westermeier, F, Goy, C, Boesenberg, U, Hallmann, J, Rodriguez-Fernandez, A, Scholz, M, Shayduk, R, Madsen, A, Grübel, G, Lehmkühler, F
Format: Article
Language:English
Subjects:
Coherence
Photon correlation spectroscopy
Physics
Speckle patterns
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Summary:We show the results of speckle contrast analysis at the MID instrument of European XFEL in the hard X-ray regime. Speckle patterns measured from static colloidal samples are compared to results previously obtained at the SPB/SFX instrument. A high degree of coherence of 0.79 is obtained by modelling the q -dependence of the speckle contrast, that corresponds to a number of coherent modes of M = 1.7. Furthermore, the variation of contrast over many pulse trains is exceptional low, resulting in a degree of coherence with a relative standard deviation below 0.1. Our results demonstrate the high stability of coherence properties at European XFEL over many X-ray pulses and pulse trains which is a prerequisite for coherence-based techniques such as MHz X-ray photon correlation spectroscopy.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/2380/1/012085