What is HiLumi?

The High Luminosity LHC (HL-LHC) is an upgrade of the LHC to achieve instantaneous luminosities a factor of five larger than the LHC nominal value, thereby enabling the experiments to enlarge their data sample by one order of magnitude compared with the LHC baseline programme. Following five years of design study and R&D, this challenging project requires now about ten years of developments, prototyping, testing and implementation; hence operation is expected to start in the middle of the next decade. The timeline of the project is dictated by the fact that, at the beginning of the next decade, many critical components of the accelerator will reach the end of their lifetime due to radiation damage and will thus need to be replaced. The upgrade phase is therefore crucial not only for the full exploitation of the LHC physics potential, but also to enable operation of the collider beyond 2025.

The HL-LHC will rely on a number of key innovative technologies, including cutting-edge 11-12 Tesla superconducting magnets, compact superconducting crab cavities with ultra-precise phase control for beam rotation, new technology for beam collimation, high-power, loss-less superconducting links, etc. A detailed description of the project and its technological and operational challenges is provided in the HL-LHC Technical Design Report  and the HL-LHC book.

The road to High Luminosity LHC: what's next for the LHC?

HL-LHC press clip with music  (Video: CERN)

The French and Swiss authorities and representatives of CERN cover the time capsule placed on the Point 1 site to mark the launch of the civil engineering work for the High-Luminosity LHC. From left to right: Lucio Rossi, High-Luminosity LHC project leader, Sijbrand de Jong, President of the CERN Council, Pierre-Alain Tschudi, Mayor of Meyrin, Pierre Maudet, President of the State Council of the Republic and Canton of Geneva, Fabiola Gianotti, CERN Director-General, Stéphane Bouillon, Prefect of the Auvergne-Rhône-Alpes region, Pascal Larour, Deputy Mayor of Cessy, and Frédérick Bordry, CERN Director for Accelerators and Technology. (Image: Maximilien Brice, Julien Ordan/CERN).