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Description
After more than two decades of user operation, the Swiss Light Source (SLS) entered a major upgrade phase in October 2023, targeting a 40-fold reduction of electron-beam emittance via a new 7-bend achromat lattice at 2.7 GeV. The vacuum system, central to machine performance, was completely rebuilt to meet the stringent requirements imposed by the compact lattice. The new storage ring vacuum consists of an 18 mm aperture, 280 m long system assembled from over 500 chambers.
Following 14 months of installation, first beam was achieved in January 2025. Vacuum conditioning represented a critical milestone, enabling delivery of light, with nominal beam current, to the first experiments in April. This contribution presents the vacuum conditioning of the SLS 2.0 storage ring during this first year of operation, from initial commissioning to user operation.
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