Smart*Light 2.0
A smarter Europe
High-quality X-ray analyses are crucial for medical applications, the preservation of cultural heritage, and the development of materials and processes that contribute to a more sustainable society. The aim of Smart*Light 2.0 is to expand a pilot instrument into a versatile research instrument.
Realisaties
Publicatie: First x-rays from a compact and tunable LINAC-based Compton scattering source
In this paper, we present the first measurements of x-rays produced with a compact, narrowband, and tunable inverse Compton scattering-based x-ray source, developed at Eindhoven University of Technology. A flux of 1.2 · 10^3 photons per shot was measured, in agreement with simulations. Using a high-resolution spectral camera, we show that the photon energy can be tuned continuously from 5.8 keV to 10.7 keV with a bandwidth of 4%. The measured x-ray pulse length was in the picosecond range. Additionally, we show that the source allows full control over the x-ray polarization control. By optimizing experimental parameters, implementing improvements to the setup and further conditioning of the accelerator structure, a brilliance of 10^12 photons/(s mrad^2 × mm^2 × 0.1%BW) can be achieved,with photon energies up to 40 keV. Because the complete electron beamline fits on a single optical table, it is suitable as an in-house x-ray source for university laboratories, industrial production lines, museums, and hospitals. https://arxiv.org/pdf/2504.118...
Publicatie: Structure–Optical Properties Relationships in Cobalt-Based Purple Pigments Used by Robert Delaunay
Following the industrial revolution and the modernization of chemistry, purple became one of the most popular colors in the palettes of late 19th- to 20th-century painters. Among them, Robert Delaunay (1885–1941) was one of the key artists of the avant-garde movement in France in the early 20th century. Although widely used in modern and contemporary paintings, inorganic purple pigments of the cobalt phosphate and cobalt arsenate families have been little studied chemically until now. The diversity of emerging chemical syntheses resulted in a wide range of products, characterized by a high diversity of hues, function of their respective composition, and crystal structures. The present work combines structural and optical analyses to probe the purple pigments used by Delaunay. Reference materials synthesized in the laboratory were characterized via synchrotron radiation-based high-angular-resolution X-ray powder diffraction and UV–vis–NIR spectroscopy. Structure–color relationships were established for the first time for several inorganic compounds of the Co–P/As family. Two of Robert Delaunay’s earliest masterpieces conserved at the Centre Pompidou in Paris were probed in situ via X-ray powder diffraction in imaging mode and fiber optic UV–vis–NIR reflectance spectroscopy. The results highlight the decisive effect of their structural chemistry on the palettes of modern and contemporary painters.
Gonzalez et al Journal American Chemical Society (2025) 147 (3): 2587–2596.
https://doi.org/10.1021/jacs.4c14523