Simulated image of the protons in an LHC bunch (left) and an HL-LHC bunch (right). (Image: CERN) CERN’s network of particle accelerators — the engines that feed the mighty Large Hadron Collider — has reached a new milestone on its journey toward unprecedented luminosity. After years of upgrades and precision testing, the accelerator chain is now capable of delivering the most intense particle beams ever produced at CERN, marking a major step toward the High-Luminosity LHC era