Solutions for the SIRIUS’ beamlines in a nutshell

Sanfelici, Lucas; Cardoso, Fernando Henríque; Piton, James; Meyer, Bernd; Polli, Jean Marie; Miqueles, Eduardo X.; Zambello, Fábio R.; Westfahl, Harry

doi:10.1063/1.5084596

Cited by 5 publications

(4 citation statements)

References 5 publications

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“…It is expected that the high flux of photons combined with the high efficiency of the X-ray beam focusing optics and the nanometric precision of motion in the different stages of the end-station push the final resolution to a few nanometers. Additionally, a very fast Medipix based detector 208 was specially developed to operate at high acquisition rates (2 kHz) with high throughput, which means that we will be able to obtain a large number of low noise images per second. Overall, for comparison, in fourth-generation synchrotrons, due to the large number of photons available, it is expected to carry out a BCDI experiment in a few seconds (minutes to tens of minutes for the third generation) with spatial resolution better than 10 nm.…”

Section: Perspectives and Challengesmentioning

confidence: 99%

Bragg Coherent Diffraction Imaging for In Situ Studies in Electrocatalysis

et al. 2021

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Electrocatalysis is at the heart of a broad range of physicochemical applications that play an important role in the present and future of a sustainable economy. Among the myriad of different electrocatalysts used in this field, nanomaterials are of ubiquitous importance. An increased surface area/volume ratio compared to bulk makes nanoscale catalysts the preferred choice to perform electrocatalytic reactions. Bragg coherent diffraction imaging (BCDI) was introduced in 2006 and since has been applied to obtain 3D images of crystalline nanomaterials. BCDI provides information about the displacement field, which is directly related to strain. Lattice strain in the catalysts impacts their electronic configuration and, consequently, their binding energy with reaction intermediates. Even though there have been significant improvements since its birth, the fact that the experiments can only be performed at synchrotron facilities and its relatively low resolution to date (∼10 nm spatial resolution) have prevented the popularization of this technique. Herein, we will briefly describe the fundamentals of the technique, including the electrocatalysis relevant information that we can extract from it. Subsequently, we review some of the computational experiments that complement the BCDI data for enhanced information extraction and improved understanding of the underlying nanoscale electrocatalytic processes. We next highlight success stories of BCDI applied to different electrochemical systems and in heterogeneous catalysis to show how the technique can contribute to future studies in electrocatalysis. Finally, we outline current challenges in spatiotemporal resolution limits of BCDI and provide our perspectives on recent developments in synchrotron facilities as well as the role of machine learning and artificial intelligence in addressing them.

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Section: Perspectives and Challengesmentioning

confidence: 99%

Bragg Coherent Diffraction Imaging for In Situ Studies in Electrocatalysis

et al. 2021

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“…The PIMEGA detector module consists of a detector head along with an ASIC electronic readout system. Medipix3RX ASICs were employed to build the detector head's semiconductor pixeled sensors [5]. Each detector module is connected to three Field Programable Gate Arrays (FPGA) read-out systems via a flexible circuit board to allow parallel readout of the Medipix3RX ASICs.…”

Section: Pimega Detectormentioning

confidence: 99%

“…One major step for commissioning beamlines at any synchrotron facility is the accurate characterization of their detection systems. Sirius, as well as other fourth generation synchrotron light sources, require high performance large area detectors [5]. Among the key aspects to efficiently make use of the capabilities of current synchrotron facilities, high frame rates, small pixel dimensions, and large active areas are fundamental for effectively dealing with high brightness's of emerging X-ray beamlines.…”

Section: Introductionmentioning

confidence: 99%

Large area hybrid detectors based on Medipix3RX: commissioning and characterization at Sirius beamlines

et al. 2023

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Hybrid pixel detectors are inherently modular and typically operate at relative low noise levels, while providing high spatial resolution, easing the assembling of large area detectors. This report summarizes the procedures and results regarding the characterization studies performed on the Medipix3RX ASIC based detector, known as PIMEGA, which was developed and is deployed at Sirius synchrotron facility at the Brazilian Synchrotron Light Laboratory. They consist of modular constructions that reach up to 170 × 170 mm2 of active area, with 300 µm thick silicon sensors, and pixel size of 55 × 55 µm2. We investigated the spatial and energy resolutions, structural noise properties, and count-rate linearity up to large fluxes from the synchrotron beamlines. The Modulation Transfer Function presents a considerably slow decay rate as a function of the spatial frequency, reaching 30% at 10.5 lp/mm, for an operation with a threshold setting equivalent to half of the incident energy. We have also found that the energy resolutions of the two highest gain modes are around 15% for 17.5 keV incident photons. In particular, we have found that, for a noise-suppressing set of configurations, the detector presents a dead time of 460 ± 10 ns. Additionally, the pile-up effect leads to a 10% loss of linearity at input fluxes of 2.3 × 105 photons/pixel.s. These results open the possibility for operating these devices with in-depth knowledge of their performance, allowing various scientific experiments, such as X-ray diffraction, computed controlled tomography, and ptychography.

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“…In our previous work on this topic [4,5], we developed a tool named IRIO that solves this issue for flexRIO and cRIO platforms and their integration in the Experimental Physics and Industrial Control System (EPICS). This approach is being used in big science facilities, such as ITER, the Korean Superconducting Tokamak test chamber [6], and the Brazilian Synchrotron Light Laboratory [7]. All these solutions are dependent on a single hardware supplier, use a custom hardware organization for the FPGA design, or have nonstandardized software layers (or a combination of these issues).…”

Section: Introductionmentioning

confidence: 99%