SOLEIL (synchrotron)

SOLEIL (synchrotron)
Name	SOLEIL
Caption	View of the SOLEIL synchrotron facility near Paris
Established	2006
Location	Saint-Aubin, Gif-sur-Yvette, Île-de-France, France
Type	Synchrotron light source

SOLEIL (synchrotron)

SOLEIL is a third-generation synchrotron radiation facility located near Paris, France, serving a broad international community of scientists from institutions such as Centre National de la Recherche Scientifique, Commissariat à l'énergie atomique et aux énergies alternatives, Université Paris-Saclay, École Polytechnique, and industrial partners including Thales Group and Airbus. The facility delivers intense beams of ultraviolet, soft X-ray, and hard X-ray radiation used by researchers from organizations such as CNRS, CEA, Institut Pasteur, University of Oxford, and Max Planck Society for experiments in physics, chemistry, materials science, biology, and engineering. SOLEIL operates within European research networks including European Synchrotron Radiation Facility collaborations, European Molecular Biology Laboratory, and frameworks like Horizon 2020.

Overview

SOLEIL is designed to provide high-brightness synchrotron radiation via an electron storage ring feeding multiple beamlines; it acts as a national facility akin to Diamond Light Source, ESRF, ALBA, and PETRA III. The site, situated in the Paris-Saclay scientific cluster alongside Saclay, Orsay, and CEA Saclay, fosters partnerships with universities and research institutes such as Sorbonne University and Université Paris-Sud. The facility supports academic and industrial users from entities like Sanofi, TotalEnergies, Schneider Electric, and international consortia spanning Japan, United States, and Germany.

History and development

Conceived in the 1990s amid discussions involving CNRS and CEA, the project drew upon expertise from facilities such as Synchrotron Soleil predecessor projects and lessons from LURE and ESRF development. Construction began in the early 2000s with milestones supported by regional authorities of Île-de-France and national funding agencies including Ministry of Higher Education and Research (France). The storage ring achieved first electrons and commissioning in 2006, with progressive expansion of user beamlines and upgrades influenced by roadmaps from European Strategy Forum on Research Infrastructures and collaborations with laboratories such as Institut Laue–Langevin and CERN-adjacent groups. Over time, SOLEIL implemented technology transfers with companies like Thales Group and research spin-offs linked to Université Paris-Saclay.

Accelerator complex and technical specifications

The accelerator complex comprises a linac injector, a full-energy booster synchrotron, and a 354-meter-class electron storage ring operating at 2.75 GeV typical energy, comparable to parameters at ALBA and tailored to match beamline requirements similar to BESSY II and SPring-8 planning. The machine employs multi-bend achromat-inspired optics, radiofrequency systems derived from designs tested at DESY, and insertion devices including undulators and wigglers produced with partners such as SOLEIL technical suppliers and firms experienced with ThomX prototypes. Typical beam current and emittance targets enable high brilliance and transverse coherence for techniques pioneered at facilities like ESRF-EBS. Vacuum systems and instrumentation incorporate components developed with engineering groups from CEA and CNRS laboratories. Control systems use industrial standards comparable to those at Fermilab and Brookhaven National Laboratory for reliability and remote operation.

Beamlines and scientific capabilities

SOLEIL hosts a diverse suite of beamlines covering soft X-ray, hard X-ray, and vacuum ultraviolet ranges, with experimental endstations supporting spectroscopy, scattering, diffraction, imaging, and microscopy. Notable beamlines and techniques parallel capabilities at Diamond Light Source and MAX IV, facilitating angle-resolved photoemission spectroscopy (ARPES) akin to experiments at Stanford Synchrotron Radiation Lightsource, X-ray absorption spectroscopy (XAS) used by groups from CNRS and CEA, and X-ray diffraction (XRD) approaches common at ESRF. Instrumentation supports cryogenic sample environments, high magnetic field setups coordinated with teams from CEA and Université Grenoble Alpes, and time-resolved pump-probe experiments in collaboration with ultrafast laser groups linked to LOA and CELIA.

Research areas and notable experiments

Research at the facility spans condensed matter physics, structural biology, catalysis, environmental science, cultural heritage, and nanotechnology. Studies on high-temperature superconductors and topological materials link to collaborations with University of Cambridge and Max Planck Institute for Solid State Research, while structural biology projects support work from Institute Pasteur and European Molecular Biology Laboratory consortia. Catalysis and energy materials investigations involve partners such as TotalEnergies and CEA, including operando XAS experiments inspired by methods developed at Argonne National Laboratory and Brookhaven National Laboratory. Environmental and atmospheric chemistry efforts connect with teams from CNRS and INRAE, whereas cultural heritage imaging collaborations include museums like the Louvre and conservation laboratories across France and Italy.

Governance, funding, and collaborations

SOLEIL is governed through a joint consortium model involving national institutions similar to governance arrangements at ESRF and Diamond Light Source, with strategic oversight from stakeholders including CNRS, CEA, and regional authorities of Île-de-France. Funding streams combine national allocations, project-based grants from agencies such as Agence Nationale de la Recherche, European funding via programs like Horizon Europe and in-kind contributions from industrial partners including Schneider Electric and Thales Group. International collaborations encompass agreements with facilities and consortia such as ESRF, MAX IV Laboratory, DESY, and universities including ETH Zurich, Imperial College London, and University of California, Berkeley, enabling user access, joint instrument development, and knowledge exchange.

Category:Synchrotron radiation facilities