there has been a “coincidental” according to the article break for 3 years at CERN. But now they are ramping up again.
"Part of the upgrade work has been to increase the power of the injectors that supply highly accelerated particle beams to the collider. Prior to the last shutdown in 2018, protons could reach an energy of 6.5 teraelectronvolts, but the upgrades mean this can now be pushed to 6.8 teraelectronvolts.
There are already plans for further improvements in 2024, which will narrow the LHC’s beams and drastically increase the number of collisions that take place. The 2018 run saw around 40 collisions every time a pulse of protons passed each other, but upgrades will push this to between 120 to 250. At that point, the LHC will take on a new name, the High Luminosity Large Hadron Collider, and it should begin experiments in 2028.
There are still many tests to be run before the power of the new components can be unleashed. Scientists at CERN hope to finish these by late February and then slowly ramp up to a small number of full-power collisions in May. The frequency of these collisions will be increased in June, which is when Steerenberg says “meaningful” physics will begin."