Speaker
Description
SOLEIL II [1] is the French upgrade project of SOLEIL delivering next-generation synchrotron light source through a full renewal of the accelerator complex, the upgrade of 29 beamlines and three laboratories, and a major IT transformation. The compact 2.75 GeV, 354 m Storage Ring will reach 50 pm round-beam emittance using an atypical 7BA–4BA lattice, extensive use of permanent-magnet technologies, nearly 100% NEG coating, 12 mm diameter vacuum chambers, a new in-vacuum nonlinear kicker for transparent top-up operation, new 4th-harmonic cavities, and 10 µm magnet alignment. The new 5 nm emittance Booster adopts a 14-HOA lattice. Both lattices are frozen, enabling construction. SOLEIL II will provide a 100-fold coherent-flux gain, a nine-decade energy range, nanoscale resolution, and fully multimodal in-operando capability. This contribution highlights how the prototype phase builds confidence in these targets, with progress in accelerator technology, in collimation, risk mitigation, and major prototypes. Building upgrades have started, and the first major equipment tenders are being launched. The project optimizes cost and ensures environmental compliance, targeting 50% electricity savings. Commissioning is expected in early 2030.
Footnotes
[1] Susini, J., Cassagne, JM., Gagey, B. et al. A brief introduction to the Synchrotron SOLEIL and its upgrade programme. Eur. Phys. J. Plus 139, 80 (2024). https://doi.org/10.1140/epjp/s13360-024-04872-2
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