Performance of Multilayer Monochromators for Hard X-Ray Imaging with Coherent Synchrotron Radiation

Dietsch, R.; Rack, Alexander; Weitkamp, Timm; Riotte, M.; Rack, T.; Holz, Thomas; Krämer, M.; Weissbach, D.; Morawe, Ch.; Siewert, Frank; Meduňa, Mojmír; Cloetens, Peter; Ziegler, Eric; McNulty, Ian; Eyberger, Catherine; Lai, Barry

doi:10.1063/1.3625308

Cited by 10 publications

(5 citation statements)

References 17 publications

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“…2(b)) to remove intensity variations. Second, a band structure due to uneven illumination generated by the multi-layer monochromator 21 (Fig. 2(c)) was corrected by dividing images by their own background derived from a spatial filter applied to each image (typically gaussian) with a large rectangular kernel of approximately 5 x 200 pixels.…”

Section: Dendrite Fragmentation Analysismentioning

confidence: 99%

The spatial and temporal distribution of dendrite fragmentation in solidifying Al-Cu alloys under different conditions

et al. 2016

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The directional columnar solidification of Al-Cu alloy dendrites was studied in-situ by synchrotron X-ray radiography to investigate the spatial and temporal distribution of dendrite fragmentation, without and with an applied pulsed electromagnetic field (PEMF) and in different solidification directions. The differing arrangements had a strong and reproducible influence on fragmentation behaviour that was rationalised using a model of solute-driven remelting of dendrite arms in microstructural regions of high vulnerability. Although absolute rates of fragmentation varied, all the fragmentation distributions had a characteristic peak in fragmentation rate at a distance of 500-800 µm into the mushy zone. Consistent with the need for solute-rich liquid flow for dendrite root re-melting, this peak was explained to occur under conditions where there was both comparatively steep liquid solute concentration gradients, measured directly from the radiographs, and relatively high permeability of the dendrite network to liquid flow.

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Section: Dendrite Fragmentation Analysismentioning

confidence: 99%

The spatial and temporal distribution of dendrite fragmentation in solidifying Al-Cu alloys under different conditions

et al. 2016

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“…The most distinct advantage of these techniques is that they do not require high energy resolution, such as X-ray fluorescence spectroscopy (XRF) [ 3 , 4 ], small-angle X-ray scattering (SAXS) [ 5 , 6 ], and X-ray micro-imaging [ 7 , 8 ]. There are many typical multilayer material combinations for monochromators, for example, Si/W [ 9 , 10 ], B 4 C/W [ 4 , 11 , 12 ], and B 4 C/Pd [ 8 , 13 , 14 ]. B4C/Pd multilayers, which have high reflectivity and good energy resolution at approximately 7–15 keV, have been used in synchrotron beamlines, such as TopoTomo (ANKA light source) [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Chemical Modification of B4C Films and B4C/Pd Layers Stored in Different Environments

Feng

Jiang

et al. 2021

Materials

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B4C/Pd multilayers with small d-spacing can easily degrade in the air, and the exact degradation process is not clear. In this work, we studied the chemical modification of B4C films and B4C/Pd double layers stored in four different environments: a dry nitrogen environment, the atmosphere, a dry oxygen-rich environment, and a wet nitrogen environment. The XANES spectra of the B4C/Pd layers placed in a dry oxygen-rich environment showed the most significant decrease in the σ* states of the B–C bonds and an increase in the π* states of the B–O bonds compared with the other samples. X-ray photoelectron spectroscopy (XPS) measurements of the samples placed in a dry oxygen-rich environment showed more intensive B-O binding signals in the B4C/Pd layers than in the single B4C film. The results of the Fourier-transform infrared spectroscopy (FTIR) showed a similar decrease in the B–C bonds and an increase in the B–O bonds in the B4C/Pd layers in contrast to the single B4C film placed in a dry oxygen-rich environment. We concluded that the combination of palladium catalysis and the high content of oxygen in the environment promoted the oxidization of boron, deteriorated the B4C composition.

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“…Nanometer-scale multilayer films used as artificial Bragg reflectors are required for a variety of applications in the research fields, such as EUV photolithography, X-ray microscopy, synchrotron radiation, plasma physics, and astrophysics123. As an outstanding candidate, Ni/C material combination is quite often studied as multilayer mirrors working in EUV and X-ray energy region.…”

mentioning

confidence: 99%

Microstructure evolution with varied layer thickness in magnetron-sputtered Ni/C multilayer films

Peng

Huang

et al. 2016

Sci Rep

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The microstructure evolution of magnetron-sputtered Ni/C multilayers was investigated by varying the Ni and C layer thickness in the region of a few nanometers. For the samples having 2.6-nm-thick C layers, the interface width increases from 0.37 to 0.81 nm as the Ni layer thickness decreases from 4.3 to 1.3 nm. Especially for the samples with Ni layers less than 2.0 nm, the interface width changes significantly due to the discontinuously distributed Ni crystallites. For the samples having 2.8-nm-thick Ni layers, the interface width increases from 0.37 to 0.59 nm when the C layer thickness decreases from 4.3 to 0.7 nm. The evolution of interface microstructures with varied Ni and C layers is explained based on a proposed simple growth model of Ni and C layers.

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Performance of Multilayer Monochromators for Hard X-Ray Imaging with Coherent Synchrotron Radiation

Cited by 10 publications

References 17 publications

The spatial and temporal distribution of dendrite fragmentation in solidifying Al-Cu alloys under different conditions

The spatial and temporal distribution of dendrite fragmentation in solidifying Al-Cu alloys under different conditions

Chemical Modification of B4C Films and B4C/Pd Layers Stored in Different Environments

Microstructure evolution with varied layer thickness in magnetron-sputtered Ni/C multilayer films

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