Speaker
Description
During summer 2025, the CERN Large Hadron Collider operated for the first time with oxygen and neon ion beams. Three different machine configurations---with collisions of p‑O, O‑O, and Ne‑Ne and with varying beam energies and optics---had to be commissioned and exploited for physics operation during the eight days allocated. This short run was challenging because of its very tight schedule, the novel modes of operation, and new beam‑physics effects such as transmutation of oxygen and neon nuclei into other nuclei with the same magnetic rigidity. In spite of these challenges the run was very successful with the luminosity targets set by the LHC experiments fully met and, in most cases, even exceeded by large factors. In addition, time was allocated for machine studies, resulting in the first LHC data on crystal channeling with O and Ne ions. In this article we give a general overview of the LHC machine configuration, operational challenges, and experience during the run, as well as the achieved performance and the key contributors to the successful outcome. The results demonstrate the LHC’s flexibility for mixed‑species operation and give valuable input for future ion
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