IUCr Newsletter

11–18 August 2026 Calgary, Canada On behalf of the International Union of Crystallography (IUCr), it is with immense excitement and joy that we cordially extend our warmest invitation to you to join the IUCr for the Twenty-Seventh Congress and General Assembly, set to be held in the magnificent city of Calgary, located in the heart of Alberta, Canada, from 11 to 18 August 2026.

Now that the equation of the diaboloid shape is known, it can be applied in an example spectrometer design. As discussed in the Introduction, we will apply the diaboloid to the Hettrick–Underwood design. We will look at three situations. Case 1 is where the vertical focusing mirror is a tangential elliptical cylinder, such that the detector width determines the horizontal acceptance of the spectrometer.

JOURNAL OF SYNCHROTRON RADIATION ISSN: 1600-5775 Volume 33| Part 4| July 2026| Launching a new era for Short Communications in Journal of Synchrotron Radiation Dibyendu Bhattacharyya,a* Kristina Kvashninab* and Makina Yabashic* aAtomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India, bRossendorf Beamline, ESRF – The European Synchrotron, 71 Avenue des Martyrs, 38000 Grenoble, France, and cBeam Line Research and Development Group, XFEL Research and...

The compositional analysis of ancient coins is of paramount importance for the study of the historical and economic context in which they were produced and circulated. To this extent, the employment of non-destructive methodologies has become increasingly prevalent in the field of numismatic research in view of safeguarding these valuable artifacts while simultaneously facilitating a deeper understanding of their composition, manufacturing processes and historical context.

Propagation-based phase-contrast micro-tomography (PPC-µCT) is one of the most widely used imaging modalities at synchrotron facilities, owing to its experimental simplicity, high photon efficiency and sensitivity across a broad range of applications.

The discovery of recoilless nuclear resonance fluorescence by Rudolf Mössbauer in 1958 revolutionized spectroscopy by enabling the observation of nuclear transitions with an energy resolution exceeding 10−13. This extraordinary precision opened direct access to hyperfine interactions—the coupling of nuclear moments with their electronic and structural environment—thereby establishing a link between atomic-scale magnetism, chemical bonding and lattice symmetry.

2.3. Imaging protocols To assess the improvement in HiP-CT data quality and compare each beamline, the brain was initially imaged at BM05 using a 25.25 µm voxel size configuration. It was later imaged at BM18 using two configurations at 42.4 µm and 23.42 µm voxel size. Following the technical evolution of the BM18 beamline described below, the same brain was imaged again with consecutive developments at 19.28 µm/voxel, 20.17 µm/voxel and 14.29 µm/voxel.

2.1. Dynamic uniform sampling Previous studies have proposed stairwise and spiral sampling to speed up tensor tomography by reducing acquisition overhead (Kim et al., 2021). In addition, Fibonacci sampling provides an effective way to achieve near-uniform spherical coverage by placing points along golden spirals (González, 2010). However, all of these methods rely on a predefined number of projections and therefore cannot adapt dynamically during acquisition.

2.4. Periphery A schematic of the control setup for the load frame is shown in Fig. 2. It features two microcontrollers [Motor Control Unit (MCU) and Raspberry Pi] placed along the load frame inside the experimental hutch, and a client software with a graphical user interface (GUI) running from the beamline's control room. Communication between the client software and the microcontroller inside the hutch is via a network using TCP/IP. Figure 2 Scheme of the control components and data flow.

One of the requirements of modern synchrotron radiation beamlines is the continuous monitoring of X-ray beam parameters, because the stability of X-ray beams directly influences the reproducibility of experiments and the safe operation of beamline optics. In a detailed review by Bilderback et al. (2005), beam diagnostics are established as a staple of synchrotron facilities, allowing the management of a series of beam parameters under the rigorously growing conditions of experiments.