Coherence properties from speckle contrast analysis at the European XFEL

Author:

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

Abstract

Abstract 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.

Publisher

IOP Publishing

Subject

General Physics and Astronomy

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