GDR CohereX 2025

7 Oct 2025, 12:30 → 9 Oct 2025, 14:00 Europe/Paris

Principal/0-0 - Salle Amphitheatre (Batiment Principal)

The research network GDR CohereX (Science with coherent X-rays at 3^rd and 4^th generation synchrotron sources) will take place from the 7^th to the 9^th of October 2025, at SOLEIL.

It aims to gather the French community using coherent X-rays covering a wide range of research fields from biological systems to magnetic and electronic structures over functional materials and cultural heritage materials up to the dynamics of matter. The General Meeting of the GDR CohereX aims to present the latest research results using coherent X-ray techniques and to share the know-how. They also aim to promote the development of innovative studies and data analysis approaches, in particular, with respect to the unique opportunities offered at upgraded extremely brilliant synchrotron sources.

GDR CohereX 2025 website

previsionnal programme.pdf

Tuesday 7 October

12:30 Welcome coffee

Opening

How coherent X-rays help to understand the dynamics of glassy water - Katrin Amman-Winkel

Probing Particle Dynamics in a Fully Opaque Porous Network Using X-ray Differential Dynamic Radiography (XDDR) - Pierre Levitz

15:45 Coffee break

From Bragg CDI to Bragg Ptychography: Recent developments and future directions - Clément Atlan

atlan_gdr_coherex_2025_compressed.pdf

Crystallisation in biomineral mollusc shell studied by 3D Bragg ptychography - Virginie Chamard

1 Crystallisation in biomineral mollusc shell studied by 3D Bragg ptychography

Biomineralization integrates complex biologically assisted physico-chemical processes leading to an extraordinary diversity of calcareous biomineral crystalline architectures, in intriguing contrast with the consistent presence of a submicrometric granular structure.
While the repeated observation of amorphous calcium carbonate is interpreted as a precursor to the crystalline phase, the crystalline transition mechanisms are poorly understood. Access to the crystalline architecture at the mesoscale, i.e., over a few granules, is key to building realistic crystallisation models. Here we exploit threedimensional X-ray Bragg ptychography microscopy to provide a series of nanoscale maps of the crystalline structure within the “single-crystalline” prism of the prismatic layer of a Pinctada margaritifera shell. The mesocrystalline organization exhibits series of micrometre-sized iso-oriented/iso-strained crystalline domains, the detailed studies of which reveal the presence of crystalline coherence domains ranging from 130 to 550 nm in size. The further increase in the lattice parameter with the size of the coherence domain likely results from the crystallisation mechanism, pointing towards a maturation process occurring after the initial amorphous-to-crystalline transition.

Reference : T. Grünewald, Peng Li, J. Duboisset, J. Nouet, O. Bikondoa, J. Vidal-Dupiol, D. Saulnier, M. Burghammer and V. Chamard, Faraday's Discussions (2022). DOI: 10.1039/d5fd00020c

4_CHAMARD.docx

Multi technique approach for Catalysis: Ammonia oxidation as case study - Andrea Resta

Poster session

Wednesday 8 October

X-ray imaging at SOLEIL and the SOLEIL II upgrade - Andrew King

Unraveling Hydrogen-Induced Phase Transitions in Palladium Nanoparticles via In Situ BCDI - Petra Khater

10:15 Coffee break

Probing the Thermally Activated Magnetisation Dynamics in Patterned Arrays - Thomas Hase

Presentation_Coherence_2025_TH.pdf

Fourier Transform Holography Of Magnetic Textures Employing Soft X-Rays With Orbital Angular Momentum - Pietro Carrara

CohereX_Carrara.pptx

12:00 Lunch

Round table

15:00 Coffee break

In Situ Bragg Coherent Diffraction Imaging From Energy Materials - Marie-Ingrid Richard

HoToPy: A toolbox for X-ray holo-tomography in Python

Convener: Jens Lucht (Uni Göttingen)

GDR CohereX 2025-HoToPy-export.pdf

Tomoptychographies des éléments constitutifs d’un composite à matrice organique utilisé dans l’aéronautique - Mathieu Ducousso

Ducousso_Tomoptycho_V2.pdf

19:30 Conference Dinner

Thursday 9 October

Imaging the Magnetic Vector Field in Thick Samples using Coherent Scattering - Marisel di Pietro Martinez

GDR-Cohrence_2025_talk Marisel.pdf

Nanosecond XPCS with two-dimensional X-ray detector - Yuriy Chushkin

GDR_CohereX_2025_YC.pdf

10:15 Coffe break

Reaching the yield point of glasses with X-ray irradiation - Alessandro Martinelli

Talk_Ale_Coherex_251009.pdf

Multi Bragg coherent X-ray diffraction imaging of strain and defect dynamics in unconventionally oriented catalytic nanoparticles - Mouad Bouita

12:00 Lunch