5 research outputs found
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Magnetic soft x-ray microscopy-imaging fast spin dynamics in magnetic nanostructures
Magnetic soft X-ray microscopy combines 15nm spatial resolution with 70ps time resolution and elemental sensitivity. Fresnel zone plates are used as X-ray optics and X-ray magnetic circular dichroism serves as magnetic contrast mechanism. Thus scientifically interesting and technologically relevant low dimensional nanomagnetic systems can be imaged at fundamental length and ultrafast time scales in a unique way. Studies include magnetization reversal in magnetic multilayers, nanopatterned systems, vortex dynamics in nanoelements and spin current induced phenomena
Focal Spot and Wavefront Sensing of an X-Ray Free Electron laser using Ronchi shearing interferometry
Abstract The Linac Coherent Light Source (LCLS) is an X-ray source of unmatched brilliance, that is advancing many scientific fields at a rapid pace. The highest peak intensities that are routinely produced at LCLS take place at the Coherent X-ray Imaging (CXI) instrument, which can produce spotsize at the order of 100 nm, and such spotsizes and intensities are crucial for experiments ranging from coherent diffractive imaging, non-linear x-ray optics and high field physics, and single molecule imaging. Nevertheless, a full characterisation of this beam has up to now not been performed. In this paper we for the first time characterise this nanofocused beam in both phase and intensity using a Ronchi Shearing Interferometric technique. The method is fast, in-situ, uses a straightforward optimization algoritm, and is insensitive to spatial jitter
Focal Spot and Wavefront Sensing of an X-Ray Free Electron laser using Ronchi shearing interferometry
The Linac Coherent Light Source (LCLS) is an X-ray source of unmatched brilliance, that is advancing many scientific fields at a rapid pace. The highest peak intensities that are routinely produced at LCLS take place at the Coherent X-ray Imaging (CXI) instrument, which can produce spotsize at the order of 100 nm, and such spotsizes and intensities are crucial for experiments ranging from coherent diffractive imaging, non-linear x-ray optics and high field physics, and single molecule imaging. Nevertheless, a full characterisation of this beam has up to now not been performed. In this paper we for the first time characterise this nanofocused beam in both phase and intensity using a Ronchi Shearing Interferometric technique. The method is fast, in-situ, uses a straightforward optimization algoritm, and is insensitive to spatial jitter
Massively parallel X-ray holography
Advances in the development of free-electron lasers offer the realistic
prospect of high-resolution imaging to study the nanoworld on the time-scale of
atomic motions. We identify X-ray Fourier Transform holography, (FTH) as a
promising but, so far, inefficient scheme to do this. We show that a uniformly
redundant array (URA) placed next to the sample, multiplies the efficiency of
X-ray FTH by more than one thousand (approaching that of a perfect lens) and
provides holographic images with both amplitude- and phase-contrast
information. The experiments reported here demonstrate this concept by imaging
a nano-fabricated object at a synchrotron source, and a bacterial cell at a
soft X-ray free-electron-laser, where illumination by a single 15 fs pulse was
successfully used in producing the holographic image. We expect with upcoming
hard X-ray lasers to achieve considerably higher spatial resolution and to
obtain ultrafast movies of excited states of matter.Comment: 5 pages, 3 figures, revte