In:
Journal of Synchrotron Radiation, International Union of Crystallography (IUCr), Vol. 28, No. 1 ( 2021-01-01), p. 52-63
Abstract:
X-ray free-electron lasers (XFELs) have opened up unprecedented opportunities for time-resolved nano-scale imaging with X-rays. Near-field propagation-based imaging, and in particular near-field holography (NFH) in its high-resolution implementation in cone-beam geometry, can offer full-field views of a specimen's dynamics captured by single XFEL pulses. To exploit this capability, for example in optical-pump/X-ray-probe imaging schemes, the stochastic nature of the self-amplified spontaneous emission pulses, i.e. the dynamics of the beam itself, presents a major challenge. In this work, a concept is presented to address the fluctuating illumination wavefronts by sampling the configuration space of SASE pulses before an actual recording, followed by a principal component analysis. This scheme is implemented at the MID (Materials Imaging and Dynamics) instrument of the European XFEL and time-resolved NFH is performed using aberration-corrected nano-focusing compound refractive lenses. Specifically, the dynamics of a micro-fluidic water-jet, which is commonly used as sample delivery system at XFELs, is imaged. The jet exhibits rich dynamics of droplet formation in the break-up regime. Moreover, pump–probe imaging is demonstrated using an infrared pulsed laser to induce cavitation and explosion of the jet.
Type of Medium:
Online Resource
ISSN:
1600-5775
DOI:
10.1107/S160057752001557X
DOI:
10.1107/S160057752001557X/il5056sup1.pdf
DOI:
10.1107/S160057752001557X/il5056sup2.mp4
DOI:
10.1107/S160057752001557X/il5056sup3.mp4
DOI:
10.1107/S160057752001557X/il5056sup4.mp4
DOI:
10.1107/S160057752001557X/il5056sup5.mp4
DOI:
10.1107/S160057752001557X/il5056sup6.mp4
Language:
Unknown
Publisher:
International Union of Crystallography (IUCr)
Publication Date:
2021
detail.hit.zdb_id:
2021413-3
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