TY  - CONF
AU  - Dallari, F.
AU  - Lokteva, I.
AU  - Moeller, Johannes
AU  - Jain, Avni
AU  - Roseker, W.
AU  - Westermeier, F.
AU  - Goy, C.
AU  - Boesenberg, U.
AU  - Hallmann, Joerg
AU  - Rodriguez-Fernandez, A.
AU  - Scholz, Markus
AU  - Shayduk, R.
AU  - Madsen, Anders
AU  - Grübel, G.
AU  - Lehmkühler, F.
TI  - Coherence properties from speckle contrast analysis at the European XFEL
JO  - Journal of physics / Conference Series
VL  - 2380
IS  - 1
SN  - 1742-6588
CY  - Bristol
PB  - IOP Publ.
M1  - PUBDB-2023-00133
SP  - 012085
PY  - 2022
AB  - 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.
T2  - 14th International Conference on Synchrotron Radiation Instrumentation
CY  - 28 Mar 2022 - 1 Apr 2022, Hamburg (Germany)
Y2  - 28 Mar 2022 - 1 Apr 2022
M2  - Hamburg, Germany
LB  - PUB:(DE-HGF)16 ; PUB:(DE-HGF)8
DO  - DOI:10.1088/1742-6596/2380/1/012085
UR  - https://bib-pubdb1.desy.de/record/491409
ER  -